vulnerability
MFSA2023-55 Thunderbird: Security Vulnerabilities fixed in Thunderbird 115.6 (CVE-2023-6856)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 9 | (AV:N/AC:M/Au:N/C:C/I:C/A:C) | Dec 19, 2023 | Dec 20, 2023 | Aug 12, 2025 |
Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
Dec 19, 2023
Added
Dec 20, 2023
Modified
Aug 12, 2025
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.
Solution
mozilla-thunderbird-upgrade-115_6
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