What’s Vulnerable › Vulnerabilities

CVE-2023-4056

• 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: 2023-08-01 · updated 2026-06-17
• Weakness: CWE-787

Description

Memory safety bugs present in Firefox 115, Firefox ESR 115.0, Firefox ESR 102.13, Thunderbird 115.0, and Thunderbird 102.13. 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 < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

Affected products

• Debian Linux: 10.0, 11.0, 12.0
• Mozilla Firefox: before 116.0; from 102.0 before 102.14; from 115.0 before 115.1 — fixed in 102.14, 115.1, 116.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 102.14, 115.1, 116.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1820587%2C1824634%2C1839235%2C1842325%2C1843847
• https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
• https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
• https://www.debian.org/security/2023/dsa-5464
• https://www.debian.org/security/2023/dsa-5469
• https://www.mozilla.org/security/advisories/mfsa2023-29/
• https://www.mozilla.org/security/advisories/mfsa2023-30/
• https://www.mozilla.org/security/advisories/mfsa2023-31/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1820587%2C1824634%2C1839235%2C1842325%2C1843847
• https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
• https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
• https://www.debian.org/security/2023/dsa-5464

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