What’s Vulnerable › Vulnerabilities

CVE-2022-28281

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-787

Description

If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

Affected products

• Mozilla Firefox: before 99.0 — fixed in 99.0
• Mozilla Firefox ESR: before 91.8 — fixed in 91.8
• Mozilla Thunderbird: before 91.8 — fixed in 91.8

How to fix

Upgrade to a fixed version: Mozilla Firefox 99.0; Mozilla Firefox ESR 91.8; Mozilla Thunderbird 91.8. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1755621
• https://www.mozilla.org/security/advisories/mfsa2022-13/
• https://www.mozilla.org/security/advisories/mfsa2022-14/
• https://www.mozilla.org/security/advisories/mfsa2022-15/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1755621
• https://www.mozilla.org/security/advisories/mfsa2022-13/
• https://www.mozilla.org/security/advisories/mfsa2022-14/
• https://www.mozilla.org/security/advisories/mfsa2022-15/

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