CVE-2016-9064: Mozilla Firefox ESR vulnerability

CVE-2016-9064: Add-on updates failed to verify that the add-on ID inside the signed package matched the ID of the add-on b...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 02:42 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw let a highly positioned network attacker replace a Firefox add-on update with a different malicious signed add-on. It only applied to Firefox before 50 and Firefox ESR before 45.5, and required both man-in-the-middle access and defeating certificate pinning. Exposure is most likely in legacy environments still running Firefox below 50 or Firefox ESR below 45.5, including old managed desktop images or unpatched Linux packages. Prioritize cleanup if legacy Firefox remains in the environment. For current supported browsers, urgency is low; for obsolete managed desktops, remediate during browser lifecycle and endpoint hardening work. Mitigation focus: Upgrade Firefox to version 50 or later.; Upgrade Firefox ESR to version 45.5 or later.; Apply vendor package updates from Mozilla, Red Hat, or Gentoo as applicable..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.mozilla.org/show_bug.cgi?id=1303418CVE reference · x_refsource_CONFIRM
GLSA-201701-15CVE reference · vendor-advisory, x_refsource_GENTOO
https://www.mozilla.org/security/advisories/mfsa2016-89/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-90/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefox ESRunspecifiedListed

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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