The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:2127-1 advisory.

  - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer     dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers,     leading to a Denial of Service (CVE-2020-13950)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

  - Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the     size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of     these restrictions and HTTP response is sent to the client with a status code indicating why the request     was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the     offending header was the very first one received or appeared in a a footer. This led to a NULL pointer     dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2     request is easy to craft and submit, this can be exploited to DoS the server. This issue affected     mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never     released. (CVE-2021-31618)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the httpd packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-202107-38 (Apache: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Apache. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0017 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2019-0190:
    A bug exists in the way mod_ssl handled client renegotiations. A remote attacker could send a carefully     crafted request that would cause mod_ssl to enter a loop leading to a denial of service. This bug can be     only triggered with Apache HTTP Server version 2.4.37 when using OpenSSL version 1.1.1 or later, due to an     interaction in changes to handling of renegotiation attempts.

    CVE-2019-0196:
    A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2     request handling could be made to access freed memory in string comparison when determining the method of     a request and thus process the request incorrectly.

    CVE-2019-0197:
    A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. When HTTP/2 was enabled for a http: host     or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not     the first request on a connection could lead to a misconfiguration and crash. Server that never enabled     the h2 protocol or that only enabled it for https: and did not set H2Upgrade on are unaffected by this     issue.

    CVE-2019-0211:
    In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in     less-privileged child processes or threads (including scripts executed by an in-process scripting     interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by     manipulating the scoreboard. Non-Unix systems are not affected.

    CVE-2019-0215:
    In Apache HTTP Server 2.4 releases 2.4.37 and 2.4.38, a bug in mod_ssl when using per-location client     certificate verification with TLSv1.3 allowed a client to bypass configured access control restrictions.

    CVE-2019-0217:
    In Apache HTTP Server 2.4 release 2.4.38 and prior, a race condition in mod_auth_digest when running in a     threaded server could allow a user with valid credentials to authenticate using another username,     bypassing configured access control restrictions.

    CVE-2019-0220:
    A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL     contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account     for duplicates in regular expressions while other aspects of the servers processing will implicitly     collapse them.

    CVE-2019-10082:
    In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made     to read memory after being freed, during connection shutdown.

    CVE-2019-10092:
    In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the     mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point     to a page of their choice. This would only be exploitable where a server was set up with proxying enabled     but was misconfigured in such a way that the Proxy Error page was displayed.

    CVE-2019-10097:
    In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy     server using the PROXY protocol, a specially crafted PROXY header could trigger a stack buffer overflow     or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by     untrusted HTTP clients.

    CVE-2019-10098:
    In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the     request URL.

    CVE-2019-9511:
    Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization     manipulation, potentially leading to a denial of service. The attacker requests a large amount of data     from a specified resource over multiple streams. They manipulate window size and stream priority to force     the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can     consume excess CPU, memory, or both.

    CVE-2019-9516:
    Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service.
    The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally     Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and     keep the allocation alive until the session dies. This can consume excess memory.

    CVE-2019-9517:
    Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to     a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint;
    however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the     wire. The attacker then sends a stream of requests for a large response object. Depending on how the     servers queue the responses, this can consume excess memory, CPU, or both.

    CVE-2020-11984:
    Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE

    CVE-2020-11993:
    Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on     certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent     use of memory pools. Configuring the LogLevel of mod_http2 above info will mitigate this vulnerability     for unpatched servers.

    CVE-2020-1927:
    In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within     the request URL.

    CVE-2020-1934:
    In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a     malicious FTP server.

    CVE-2020-9490:
    Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a     HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource     afterwards. Configuring the HTTP/2 feature via H2Push off will mitigate this vulnerability for unpatched     servers.

    CVE-2021-26690:
    Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service

    CVE-2021-30641:
    Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

    CVE-2021-34798:
    Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP     Server 2.4.48 and earlier.

    CVE-2021-39275:
    ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules     pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache     HTTP Server 2.4.48 and earlier.

    CVE-2021-44790:
    A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser     (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the     vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and     earlier.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2021_4257 advisory.

    * httpd: mod_session: NULL pointer dereference when parsing Cookie header (CVE-2021-26690)

    * httpd: Unexpected URL matching with 'MergeSlashes OFF' (CVE-2021-30641)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote host is prior to 2.4.48-2. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1674 advisory.

    A flaw was found in Apache httpd. The mod_proxy_wstunnel module tunnels non-upgraded connections.
    (CVE-2019-17567)

    A flaw was found in HTTPd. In some Apache HTTP Server versions, unprivileged local users can stop HTTPd on     Windows. The highest threat from this vulnerability is to system availability. (CVE-2020-13938)

    A flaw was found In Apache httpd. The mod_proxy has a NULL pointer dereference. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-13950)

    A flaw was found in Apache httpd. The mod_auth_digest has a single zero byte stack overflow. The highest     threat from this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-35452)

    A NULL pointer dereference was found in Apache httpd mod_session. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-26690)

    A heap overflow flaw was found In Apache httpd mod_session. The highest threat from this vulnerability is     to system availability. (CVE-2021-26691)

    A flaw was found in Apache httpd. A possible regression from an earlier security fix broke behavior of     MergeSlashes. The highest threat from this vulnerability is to data integrity. (CVE-2021-30641)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the httpd package has been released.

According to the versions of the httpd packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4257 advisory.

    The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

    Security Fix(es):

    * httpd: mod_session: NULL pointer dereference when parsing Cookie header (CVE-2021-26690)

    * httpd: Unexpected URL matching with 'MergeSlashes OFF' (CVE-2021-30641)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4614 advisory.

    This release adds the new Apache HTTP Server 2.4.37 Service Pack 10 packages that are part of the JBoss     Core Services offering.

    This release serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Service     Pack 9 and includes bug fixes and enhancements. Refer to the Release Notes for information on the most     significant bug fixes and enhancements included in this release.

    Security Fix(es):

    * httpd: Single zero byte stack overflow in mod_auth_digest (CVE-2020-35452)
    * httpd: mod_session NULL pointer dereference in parser (CVE-2021-26690)
    * httpd: Heap overflow in mod_session (CVE-2021-26691)
    * httpd: mod_proxy_wstunnel tunneling of non Upgraded connection (CVE-2019-17567)
    * httpd: MergeSlashes regression (CVE-2021-30641)
    * httpd: mod_proxy NULL pointer dereference (CVE-2020-13950)
    * jbcs-httpd24-openssl: openssl: NULL pointer dereference in X509_issuer_and_serial_hash()     (CVE-2021-23841)
    * openssl: Read buffer overruns processing ASN.1 strings (CVE-2021-3712)
    * openssl: integer overflow in CipherUpdate (CVE-2021-23840)
    * pcre: buffer over-read in JIT when UTF is disabled (CVE-2019-20838)
    * pcre: integer overflow in libpcre (CVE-2020-14155)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2021-30641 advisory.

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名稱	產品	系列	已發布	已更新	嚴重性
151694	openSUSE 15 Security Update : apache2 (openSUSE-SU-2021:2127-1)	Nessus	SuSE Local Security Checks	2021/7/16	2021/9/24	critical
155517	EulerOS Virtualization 2.9.0 : httpd (EulerOS-SA-2021-2779)	Nessus	Huawei Local Security Checks	2021/11/17	2022/4/18	critical
156972	GLSA-202107-38 : Apache: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2022/1/24	2022/1/26	critical
239371	TencentOS Server 3: httpd:2.4 (TSSA-2022:0017)	Nessus	Tencent Local Security Checks	2025/6/16	2025/12/4	critical
357638	Rocky Linux 8 [CIQ] Security Update: httpd / httpd-debuginfo / httpd-debugsource / httpd-devel / etc Multiple Vulnerabilities (crlsa-2021_4257)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	medium
151272	Amazon Linux 2 : httpd (ALAS-2021-1674)	Nessus	Amazon Linux Local Security Checks	2021/7/1	2024/12/11	critical
151436	Photon OS 1.0: Httpd PHSA-2021-1.0-0409	Nessus	PhotonOS Local Security Checks	2021/7/7	2024/7/22	critical
153682	EulerOS 2.0 SP9 : httpd (EulerOS-SA-2021-2529)	Nessus	Huawei Local Security Checks	2021/9/27	2021/9/27	critical
155086	RHEL 8 : httpd:2.4 (RHSA-2021:4257)	Nessus	Red Hat Local Security Checks	2021/11/11	2024/11/7	medium
155223	RHEL 7 / 8 : Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP10 (RHSA-2021:4614)	Nessus	Red Hat Local Security Checks	2021/11/11	2024/11/7	critical
155534	EulerOS Virtualization 2.9.1 : httpd (EulerOS-SA-2021-2746)	Nessus	Huawei Local Security Checks	2021/11/17	2022/4/18	critical
157958	EulerOS Virtualization 3.0.6.0 : httpd (EulerOS-SA-2022-1069)	Nessus	Huawei Local Security Checks	2022/2/12	2022/2/12	critical
172813	CBL Mariner 2.0 Security Update: httpd (CVE-2021-30641)	Nessus	MarinerOS Local Security Checks	2023/3/20	2025/2/10	medium

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