Information disclosure in Mozilla Firefox
CVE-2021-23973
When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
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:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.014 (70.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Mozilla Firefox — versions < 86
- Mozilla Firefox Esr — versions < 78.8
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions < 78.8
- Debian Linux — versions 9.0, 10.0
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2021-07/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2021-09/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2021-08/ (Release Notes, Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2021/03/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2021/dsa-4866 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202104-10 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202104-09 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-23973?
- CVE-2021-23973 is a medium-severity vulnerability in Mozilla Firefox, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 6.5/10. Published 2021-02-26.
- How severe is CVE-2021-23973?
- Medium severity. CVSS v3 base score is 6.5 out of 10.