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…
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
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.
Timeline
ID reserved
By mozilla
- 4 months later
· 4 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.4 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (8 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Weakness
Affected products
n/a
- affected n/a
References (13)
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.mozilla.org/security/announce/2016/mfsa2016-85.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mozilla.org/security/advisories/mfsa2016-86/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://blog.mozilla.org/security/2016/09/16/update-on-add-on-pinning-vulnerability/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://hackernoon.com/tor-browser-exposed-anti-privacy-implantation-at-mass-scale-bd68e9eb1e95 (opens in a new tab)x_refsource_MISCx_transferred
- DSA-3674 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1303127 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [dailydave] 20160915 Deep down the certificate pinning rabbit hole of "Tor Browser Exposed" (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- GLSA-201701-15 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- RHSA-2016:1912 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://www.mozilla.org/security/advisories/mfsa2016-88/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- 93049 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 1036852 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-5284)Record last updated .