CVE-2023-6209

MEDIUM

Firefox < 120, Firefox ESR < 115.5.0, Thunderbird < 115.5 - Path Traversal via Relative URL Parsing

Title source: llm

Description

Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in the path could be used to override the specified host. This could contribute to security problems in web sites. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

References (7)

Core 7

Core References

Issue Tracking, Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=1858570

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/

Mailing List

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

Scores

CVSS v3 6.5

EPSS 0.0038

EPSS Percentile 59.4%

Attack Vector NETWORK

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

Details

CWE

CWE-22

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