Vulnerability in Mozilla Firefox
CVE-2020-26973
Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.016 · change: +0.001
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
References
- www.mozilla.org/security/advisories/mfsa2020-54/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-56/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-55/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
Frequently asked questions
- What is CVE-2020-26973?
- CVE-2020-26973 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 8.8/10. Published 2021-01-07.
- How severe is CVE-2020-26973?
- High severity. CVSS v3 base score is 8.8 out of 10.