CVE-2016-5284: mozilla firefox Improper Input Validation
Vulnerability summary
CVE-2016-5284 is a high (CVSS 7.4) Improper Input Validation vulnerability in mozilla firefox. EPSS estimates a 2.37% chance of exploitation in the next 30 days, higher than 83.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 12 · Related 7Timeline
- 22-09-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.4HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.4HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
EPSS trend
Probability
2.37%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
0.00 pp
From 2.37% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu2 products
- firefox< 49.0+build4-0ubuntu0.14.04.1 | < 49.0+build4-0ubuntu0.16.04.1
- thunderbird< 1:45.4.0+build1-0ubuntu0.14.04.1 | < 1:45.4.0+build1-0ubuntu0.16.04.1
Debian1 product
- firefox-esr< 45.4.0esr-1
Mozilla1 product
- firefox≤ 48.0.2 | 45.0 | 45.0.1 | 45.0.2 | 45.1.1 | 45.2.0 | 45.3.0
3 vendors · 4 products
References
19 links- www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlX Refsource CONFIRM
- www.mozilla.org/security/advisories/mfsa2016-86/X Refsource CONFIRM
- blog.mozilla.org/security/2016/09/16/update-on-add-on-pinning-vulnerability/X Refsource CONFIRMThird Party AdvisoryVDB Entry
- hackernoon.com/tor-browser-exposed-anti-privacy-implantation-at-mass-scale-bd68e9eb1e95X Refsource MISCTechnical Description
- bugzilla.mozilla.org/show_bug.cgi?id=1303127X Refsource CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
Show all 19 references
- www.mozilla.org/security/advisories/mfsa2016-88/X Refsource CONFIRM