AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2023-6856

HIGH · CVSS 8.8 EPSS 20.47% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2023-12-19 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 8.8. It affects Firefox. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 20.5% probability of exploitation in the next 30 days. It may be remotely exploitable.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
remote code execution code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2023-6856
Severity
HIGH
CVSS
8.8
EPSS
20.47%
Firefox

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)