Use After Free in Mozilla Firefox
CVE-2023-6205
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 10.0, 11.0, 12.0
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2023-49/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-50/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-52/ (Release Notes, Vendor Advisory)
- www.debian.org/security/2023/dsa-5561 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/11/msg00017.html (Mailing List)
- lists.debian.org/debian-lts-announce/2023/11/msg00030.html
Frequently asked questions
- What is CVE-2023-6205?
- CVE-2023-6205 is a medium-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 6.5/10. Published 2023-11-21.
- How severe is CVE-2023-6205?
- Medium severity. CVSS v3 base score is 6.5 out of 10.