What’s Vulnerable › Vulnerabilities

CVE-2021-38501

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-03 · updated 2026-06-17

Description

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.

Affected products

• Mozilla Firefox: before 93.0 — fixed in 93.0
• Mozilla Firefox ESR: before 91.2 — fixed in 91.2
• Mozilla Thunderbird: before 91.2 — fixed in 91.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 93.0; Mozilla Firefox ESR 91.2; Mozilla Thunderbird 91.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685354%2C1715755%2C1723176
• https://www.mozilla.org/security/advisories/mfsa2021-43/
• https://www.mozilla.org/security/advisories/mfsa2021-45/
• https://www.mozilla.org/security/advisories/mfsa2021-47/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685354%2C1715755%2C1723176
• https://www.mozilla.org/security/advisories/mfsa2021-43/
• https://www.mozilla.org/security/advisories/mfsa2021-45/
• https://www.mozilla.org/security/advisories/mfsa2021-47/

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