What’s Vulnerable › Vulnerabilities

CVE-2022-38478

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-787

Description

Members the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 103, Firefox ESR 102.1, and Firefox ESR 91.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 102.2, Thunderbird < 91.13, Firefox ESR < 91.13, Firefox ESR < 102.2, and Firefox < 104.

Affected products

• Mozilla Firefox: before 104.0; from 102.0 before 102.2 — fixed in 102.2, 104.0
• Mozilla Firefox ESR: before 91.13 — fixed in 91.13
• Mozilla Thunderbird: before 91.13; from 102.0 before 102.2 — fixed in 102.2, 91.13

How to fix

Upgrade to a fixed version: Mozilla Firefox 102.2, 104.0; Mozilla Firefox ESR 91.13; Mozilla Thunderbird 102.2, 91.13. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1770630%2C1776658
• https://www.mozilla.org/security/advisories/mfsa2022-33/
• https://www.mozilla.org/security/advisories/mfsa2022-34/
• https://www.mozilla.org/security/advisories/mfsa2022-35/
• https://www.mozilla.org/security/advisories/mfsa2022-36/
• https://www.mozilla.org/security/advisories/mfsa2022-37/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1770630%2C1776658
• https://www.mozilla.org/security/advisories/mfsa2022-33/
• https://www.mozilla.org/security/advisories/mfsa2022-34/
• https://www.mozilla.org/security/advisories/mfsa2022-35/
• https://www.mozilla.org/security/advisories/mfsa2022-36/
• https://www.mozilla.org/security/advisories/mfsa2022-37/

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