What’s Vulnerable › Vulnerabilities

CVE-2023-34416

• Severity: critical (CVSS 9.8 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: 2023-06-19 · updated 2026-10-24
• Weakness: CWE-787

Description

Memory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12. 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 Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.

Affected products

• Mozilla Firefox: before 114.0 — fixed in 114.0
• Mozilla Firefox ESR: before 102.12 — fixed in 102.12
• Mozilla Thunderbird: before 102.12 — fixed in 102.12

How to fix

Upgrade to a fixed version: Mozilla Firefox 114.0; Mozilla Firefox ESR 102.12; Mozilla Thunderbird 102.12. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1752703%2C1818394%2C1826875%2C1827340%2C1827655%2C1828065%2C1830190%2C1830206%2C1830795%2C1833339
• https://security.gentoo.org/glsa/202312-03
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-19/
• https://www.mozilla.org/security/advisories/mfsa2023-20/
• https://www.mozilla.org/security/advisories/mfsa2023-21/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1752703%2C1818394%2C1826875%2C1827340%2C1827655%2C1828065%2C1830190%2C1830206%2C1830795%2C1833339
• https://security.gentoo.org/glsa/202312-03
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-19/
• https://www.mozilla.org/security/advisories/mfsa2023-20/
• https://www.mozilla.org/security/advisories/mfsa2023-21/

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