CVE-2016-5284

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Summary

CVECVE-2016-5284
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-09-22 22:59:18 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionMozilla 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.

Risk And Classification

Primary CVSS: v3.0 7.4 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

EPSS: 0.005450000 probability, percentile 0.678230000 (date 2026-05-06)

Problem Types: CWE-20 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.4HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mozilla Firefox 45.0 All All All
Application Mozilla Firefox 45.0.1 All All All
Application Mozilla Firefox 45.0.2 All All All
Application Mozilla Firefox 45.1.1 All All All
Application Mozilla Firefox 45.2.0 All All All
Application Mozilla Firefox 45.3.0 All All All
Application Mozilla Firefox All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-3674-1 firefox-esr af854a3a-2127-422b-91ae-364da2661108 www.debian.org
Security vulnerabilities fixed in Firefox 49 — Mozilla af854a3a-2127-422b-91ae-364da2661108 www.mozilla.org Release Notes
Tor Browser Exposed: Anti-Privacy Implantation at Mass Scale | Hacker Noon af854a3a-2127-422b-91ae-364da2661108 hackernoon.com Technical Description
Security vulnerabilities fixed in Thunderbird 45.4 — Mozilla af854a3a-2127-422b-91ae-364da2661108 www.mozilla.org
1303127 – (CVE-2016-5284) ESR-45/Tor Browser certificate pinning bypass for addons.mozilla.org and other built-in sites af854a3a-2127-422b-91ae-364da2661108 bugzilla.mozilla.org Issue Tracking, Third Party Advisory, VDB Entry
Security vulnerabilities fixed in Firefox ESR 45.4 — Mozilla af854a3a-2127-422b-91ae-364da2661108 www.mozilla.org
Dailydave: Deep down the certificate pinning rabbit hole of "Tor Browser Exposed" af854a3a-2127-422b-91ae-364da2661108 seclists.org Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Mozilla Firefox Multiple Security Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Update on add-on pinning vulnerability | Mozilla Security Blog af854a3a-2127-422b-91ae-364da2661108 blog.mozilla.org Third Party Advisory, VDB Entry
Oracle Linux Bulletin - October 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
Mozilla Firefox Multiple Flaws Let Remote Users Execute Arbitrary Code, Bypass Security Restrictions, Determine File Paths, and Obtain Potentially Sensitive Information - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
Mozilla Firefox, Thunderbird: Multiple vulnerabilities (GLSA 201701-15) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 710500 Gentoo Linux Mozilla Firefox, Thunderbird Multiple Vulnerabilities (GLSA 201701-15)
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