Information disclosure in Mozilla Firefox
CVE-2021-23968
If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.013 (69.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.013 · change: +0.001
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-2021-23968?
- CVE-2021-23968 is a medium-severity vulnerability in Mozilla Firefox, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 4.3/10. Published 2021-02-26.
- How severe is CVE-2021-23968?
- Medium severity. CVSS v3 base score is 4.3 out of 10.