In Network Security Services before 3.44, a malformed Netscape Certificate Sequence can cause NSS to crash, resulting in a denial of service.
https://bugzilla.mozilla.org/show_bug.cgi?id=1533216
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44_release_notes