CVE-2023-6205

MEDIUM

Firefox < 120 and Firefox ESR < 115.5.0 - Use-After-Free in MessagePort

Title source: llm

Description

It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

References (7)

Core 7

Core References

Mailing List

https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html

Issue Tracking, Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=1854076

Mailing List

https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html

Third Party Advisory

https://www.debian.org/security/2023/dsa-5561

Release Notes, Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2023-49/

Release Notes, Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2023-50/

Release Notes, Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2023-52/

Scores

CVSS v3 6.5

EPSS 0.0041

EPSS Percentile 61.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-416

Status published

Products (6)

debian/debian_linux 10.0

debian/debian_linux 11.0

debian/debian_linux 12.0

mozilla/firefox < 120.0

mozilla/firefox_esr < 115.5.0

mozilla/thunderbird < 115.5

Published Nov 21, 2023

Tracked Since Feb 18, 2026