What’s Vulnerable › Vulnerabilities

CVE-2023-23605: Memory safety bugs fixed in Firefox 109 and Firefox ESR 102.7

• Severity: high (CVSS 8.8 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: none known
• Published: 2023-06-02 · updated 2026-10-24
• Weakness: CWE-787

Description

Mozilla developers and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 108 and Firefox ESR 102.6. 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 < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Affected products

• Mozilla Firefox: before 109.0 — fixed in 109.0
• Mozilla Firefox ESR: before 102.7 — fixed in 102.7
• Mozilla Thunderbird: before 102.7 — fixed in 102.7

How to fix

Upgrade to a fixed version: Mozilla Firefox 109.0; Mozilla Firefox ESR 102.7; Mozilla Thunderbird 102.7. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1764921%2C1802690%2C1806974
• https://www.mozilla.org/security/advisories/mfsa2023-01/
• https://www.mozilla.org/security/advisories/mfsa2023-02/
• https://www.mozilla.org/security/advisories/mfsa2023-03/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1764921%2C1802690%2C1806974
• https://www.mozilla.org/security/advisories/mfsa2023-01/
• https://www.mozilla.org/security/advisories/mfsa2023-02/
• https://www.mozilla.org/security/advisories/mfsa2023-03/

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