What’s Vulnerable › Vulnerabilities

CVE-2022-22753

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-367

Description

A Time-of-Check Time-of-Use bug existed in the Maintenance (Updater) Service that could be abused to grant Users write access to an arbitrary directory. This could have been used to escalate to SYSTEM access.<br>*This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

Affected products

• Mozilla Firefox: before 97.0 — fixed in 97.0
• Mozilla Firefox ESR: before 91.6 — fixed in 91.6
• Mozilla Thunderbird: before 91.6 — fixed in 91.6

How to fix

Upgrade to a fixed version: Mozilla Firefox 97.0; Mozilla Firefox ESR 91.6; Mozilla Thunderbird 91.6. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1732435
• https://www.mozilla.org/security/advisories/mfsa2022-04/
• https://www.mozilla.org/security/advisories/mfsa2022-05/
• https://www.mozilla.org/security/advisories/mfsa2022-06/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1732435
• https://www.mozilla.org/security/advisories/mfsa2022-04/
• https://www.mozilla.org/security/advisories/mfsa2022-05/
• https://www.mozilla.org/security/advisories/mfsa2022-06/

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