CVE-2023-6856

high-risk

Published 2023-12-19

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

Do I need to act?

11.0% chance of exploitation in next 30 days

EPSS score — higher than 89% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.8/10 High

NETWORK / LOW complexity

Affected Products (6)

Firefox

Firefox Esr

Thunderbird

Debian Linux

Affected Vendors

Debian Mozilla

References (18)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1843782

Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html

Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html

Third Party Advisory https://security.gentoo.org/glsa/202401-10

Third Party Advisory https://www.debian.org/security/2023/dsa-5581

Third Party Advisory https://www.debian.org/security/2023/dsa-5582

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-54/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-55/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-56/