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CVE-2020-6821

Date: April 24, 2020

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.

Severity Score

Related Resources (11)

https://usn.ubuntu.com/4335-1/
https://nvd.nist.gov/vuln/detail/CVE-2020-6821
https://www.mozilla.org/security/advisories/mfsa2020-12/
https://access.redhat.com/security/cve/CVE-2020-6821
https://security.alpinelinux.org/vuln/CVE-2020-6821
https://bugzilla.mozilla.org/show_bug.cgi?id=1625404
https://security-tracker.debian.org/tracker/CVE-2020-6821
https://www.mozilla.org/security/advisories/mfsa2020-14/
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-6821
https://www.mozilla.org/security/advisories/mfsa2020-13/
https://www.mend.io/vulnerability-database/CVE-2020-6821

Severity Score

Weakness Type (CWE)

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

Use of Uninitialized Resource

CWE-908

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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