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CVE-2023-6856
The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This…
High8.8EPSS 20.6%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
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.
Timeline
ID reserved
By mozilla
- 4 days later
· 4 days later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 20.6% · top 2.5% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
- Heap-buffer-overflow affecting WebGL DrawElementsInstanced method with Mesa VM driver
- CWE-787 (opens in a new tab)All about CWE-787 and its CVEs
Affected products
- affected unspecified – < 115.6
- affected unspecified – < 115.6
- affected unspecified – < 121
References (9)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1843782 (opens in a new tab)x_transferred
- https://www.mozilla.org/security/advisories/mfsa2023-54/ (opens in a new tab)x_transferred
- https://www.mozilla.org/security/advisories/mfsa2023-55/ (opens in a new tab)x_transferred
- https://www.mozilla.org/security/advisories/mfsa2023-56/ (opens in a new tab)x_transferred
- https://www.debian.org/security/2023/dsa-5581 (opens in a new tab)x_transferred
- https://www.debian.org/security/2023/dsa-5582 (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html (opens in a new tab)x_transferred
- https://security.gentoo.org/glsa/202401-10 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-6856)Record last updated .