CVE-2016-5284

Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 rely on unintended expiration dates for Preloaded Public Key Pinning, which allows man-in-the-middle attackers to spoof add-on updates by leveraging possession of an X.509 server certificate for addons.mozilla.org signed by an arbitrary built-in Certification Authority.

• CWE-20

• http://rhn.redhat.com/errata/RHSA-2016-1912.html
• http://seclists.org/dailydave/2016/q3/51Third Party Advisory
• http://www.debian.org/security/2016/dsa-3674
• http://www.mozilla.org/security/announce/2016/mfsa2016-85.htmlRelease Notes
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
• http://www.securityfocus.com/bid/93049
• http://www.securitytracker.com/id/1036852
• https://blog.mozilla.org/security/2016/09/16/update-on-add-on-pinning-vulnerability/Third Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1303127Issue Tracking, Third Party Advisory, VDB Entry
• https://hackernoon.com/tor-browser-exposed-anti-privacy-implantation-at-mass-scale-bd68e9eb1e95Technical Description
• https://security.gentoo.org/glsa/201701-15
• https://www.mozilla.org/security/advisories/mfsa2016-86/
• https://www.mozilla.org/security/advisories/mfsa2016-88/
• http://rhn.redhat.com/errata/RHSA-2016-1912.html
• http://seclists.org/dailydave/2016/q3/51Third Party Advisory
• http://www.debian.org/security/2016/dsa-3674
• http://www.mozilla.org/security/announce/2016/mfsa2016-85.htmlRelease Notes
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
• http://www.securityfocus.com/bid/93049
• http://www.securitytracker.com/id/1036852
• https://blog.mozilla.org/security/2016/09/16/update-on-add-on-pinning-vulnerability/Third Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1303127Issue Tracking, Third Party Advisory, VDB Entry
• https://hackernoon.com/tor-browser-exposed-anti-privacy-implantation-at-mass-scale-bd68e9eb1e95Technical Description
• https://security.gentoo.org/glsa/201701-15
• https://www.mozilla.org/security/advisories/mfsa2016-86/
• https://www.mozilla.org/security/advisories/mfsa2016-88/

Published

Sep 22, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2016-5278Heap-based buffer overflow in the nsBMPEncoder::AddImageFram…
• CVE-2016-5279Mozilla Firefox before 49.0 allows user-assisted remote atta…
• CVE-2016-5280Use-after-free vulnerability in the mozilla::nsTextNodeDirec…
• CVE-2016-5281Use-after-free vulnerability in the DOMSVGLength class in Mo…
• CVE-2016-5282Mozilla Firefox before 49.0 does not properly restrict the s…
• CVE-2016-5283Mozilla Firefox before 49.0 allows remote attackers to bypas…
• CVE-2016-5285A Null pointer dereference vulnerability exists in Mozilla N…7.5
• CVE-2016-5287A potentially exploitable use-after-free crash during actor …
• CVE-2016-5288Web content could access information in the HTTP cache if e1…
• CVE-2016-5289Memory safety bugs were reported in Firefox 49. Some of thes…
• CVE-2016-5290Memory safety bugs were reported in Firefox 49 and Firefox E…
• CVE-2016-5291A same-origin policy bypass with local shortcut files to loa…