Vulnerability in Mozilla Firefox
CVE-2020-6821
When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.3% 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: 0.015 · change: +0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2020-13/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-12/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-14/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- usn.ubuntu.com/4335-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-6821?
- CVE-2020-6821 is a high-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 7.5/10. Published 2020-04-24.
- How severe is CVE-2020-6821?
- High severity. CVSS v3 base score is 7.5 out of 10.