CVE-2020-6821

high

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.

References

https://www.mozilla.org/security/advisories/mfsa2020-13/

https://www.mozilla.org/security/advisories/mfsa2020-14/

https://www.mozilla.org/security/advisories/mfsa2020-12/

https://bugzilla.mozilla.org/show_bug.cgi?id=1625404

https://usn.ubuntu.com/4335-1/

Details

Source: MITRE

Published: 2020-04-24

Updated: 2021-07-21

Type: CWE-119

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH