CVE-2013-5607: Integer overflow in the PL_ArenaAllocate function in Mozilla Netscape Portable Runtime (NSPR) before 4.10.2...

Security readout for executives and security teams

CVE-2013-5607 is an old Mozilla NSPR flaw where a specially crafted X.509 certificate could crash affected software. The public record names Firefox, Firefox ESR, and SeaMonkey versions using vulnerable NSPR. Business urgency is mainly legacy exposure: modern maintained systems should already have vendor fixes, but unmanaged old browsers or packaged dependencies may remain exposed. Exposure is most likely in legacy desktops, server-side tooling, embedded products, or Linux distribution packages that still include NSPR before 4.10.2 or the listed old Mozilla applications. Current supported browsers and patched distro packages are unlikely to be exposed, but verification is needed where old appliances or pinned packages remain in service. Treat this as a legacy hygiene issue unless vulnerable versions are still present in production or managed desktops. Prioritize remediation where old browsers, certificate-processing tools, or embedded products process untrusted certificates. No source in the bundle supports active exploitation, but unsupported software should not be accepted as a long-term exception. Mitigation focus: Upgrade NSPR to 4.10.2 or later where vendor packages support it.; Update Firefox, Firefox ESR, and SeaMonkey beyond the fixed versions named in the CVE record.; Apply relevant OS vendor advisories for Debian, Ubuntu, Red Hat, Gentoo, or SUSE packages..

Prepared

Jun 14, 2026, 15:13 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.