High severity · published Apr 24, 2020
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
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 75.0 · source: NVD
FE
Firefox Esr · Mozilla
before 68.7.0 · source: NVD
TH
Thunderbird · Mozilla
before 68.7.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-6821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-6821
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1625404
Third Party Advisory
https://usn.ubuntu.com/4335-1/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-12/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-13/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-14/
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