What’s Vulnerable › Vulnerabilities

CVE-2017-7766

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17

Description

An attack using manipulation of "updater.ini" contents, used by the Mozilla Windows Updater, and privilege escalation through the Mozilla Maintenance Service to allow for arbitrary file execution and deletion by the Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54.

Affected products

• Mozilla Firefox: before 52.2.0; before 54.0 — fixed in 52.2.0, 54.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 52.2.0, 54.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/99057
• http://www.securitytracker.com/id/1038689
• https://bugzilla.mozilla.org/show_bug.cgi?id=1342742
• https://www.mozilla.org/security/advisories/mfsa2017-15/
• https://www.mozilla.org/security/advisories/mfsa2017-16/
• http://www.securityfocus.com/bid/99057
• http://www.securitytracker.com/id/1038689
• https://bugzilla.mozilla.org/show_bug.cgi?id=1342742
• https://www.mozilla.org/security/advisories/mfsa2017-15/
• https://www.mozilla.org/security/advisories/mfsa2017-16/

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