CVE-2016-9064

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-295

Description

Add-on updates failed to verify that the add-on ID inside the signed package matched the ID of the add-on being updated. An attacker who could perform a man-in-the-middle attack on the user's connection to the update server and defeat the certificate pinning protection could provide a malicious signed add-on instead of a valid update. This vulnerability affects Firefox ESR < 45.5 and Firefox < 50.

Affected products

Mozilla Firefox: before 45.5.0; before 50.0 — fixed in 45.5.0, 50.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 45.5.0, 50.0. Check the vendor advisory for mitigations.

References

http://rhn.redhat.com/errata/RHSA-2016-2780.html
http://www.securityfocus.com/bid/94336
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1303418
https://security.gentoo.org/glsa/201701-15
https://www.mozilla.org/security/advisories/mfsa2016-89/
https://www.mozilla.org/security/advisories/mfsa2016-90/
http://rhn.redhat.com/errata/RHSA-2016-2780.html
http://www.securityfocus.com/bid/94336
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1303418
https://security.gentoo.org/glsa/201701-15

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