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CVE-2020-6821

HIGH7.5

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

Published Apr 24, 2020

Modified 1 years ago

Fix available

Details

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.

Affected Packages

Ubuntu:14.04:LTSFirefox

Fixed in:

75

Ubuntu:16.04:LTSFirefox

Fixed in:

75

Ubuntu:18.04:LTSFirefox

Fixed in:

75

Ubuntu:20.04:LTSFirefox

Fixed in:

75

Ubuntu:22.04:LTSFirefox

Fixed in:

75

Ubuntu:24.04:LTSFirefox

Fixed in:

75

Ubuntu:25.04Firefox

Fixed in:

75

Ubuntu:25.10Firefox

Fixed in:

75

Windows:10240Mozilla Firefox

Fixed in:

75

Windows:10240Mozilla Firefox ESR

Fixed in:

68.7

Windows:14393Mozilla Firefox

Fixed in:

75

Windows:14393Mozilla Firefox ESR

Fixed in:

68.7

Windows:17763Mozilla Firefox

Fixed in:

75

Windows:17763Mozilla Firefox ESR

Fixed in:

68.7

Windows:18362Mozilla Firefox

Fixed in:

75

Windows:18362Mozilla Firefox ESR

Fixed in:

68.7

Windows:18363Mozilla Firefox

Fixed in:

75

Windows:18363Mozilla Firefox ESR

Fixed in:

68.7

Windows:19041Mozilla Firefox

Fixed in:

75

Windows:19041Mozilla Firefox ESR

Fixed in:

68.7

Windows:19042Mozilla Firefox

Fixed in:

75

Windows:19042Mozilla Firefox ESR

Fixed in:

68.7

Windows:19043Mozilla Firefox

Fixed in:

75

Windows:19043Mozilla Firefox ESR

Fixed in:

68.7

Windows:19044Mozilla Firefox

Fixed in:

75

Windows:19044Mozilla Firefox ESR

Fixed in:

68.7

Windows:19045Mozilla Firefox

Fixed in:

75

Windows:19045Mozilla Firefox ESR

Fixed in:

68.7

Windows:20348Mozilla Firefox

Fixed in:

75

Windows:20348Mozilla Firefox ESR

Fixed in:

68.7

Windows:22000Mozilla Firefox

Fixed in:

75

Windows:22000Mozilla Firefox ESR

Fixed in:

68.7

Windows:22621Mozilla Firefox

Fixed in:

75

Windows:22621Mozilla Firefox ESR

Fixed in:

68.7

Windows:22631Mozilla Firefox

Fixed in:

75

Windows:22631Mozilla Firefox ESR

Fixed in:

68.7

Windows:25398Mozilla Firefox

Fixed in:

75

Windows:25398Mozilla Firefox ESR

Fixed in:

68.7

Windows:26100Mozilla Firefox

Fixed in:

75

Windows:26100Mozilla Firefox ESR

Fixed in:

68.7

Windows:26200Mozilla Firefox

Fixed in:

75

Windows:26200Mozilla Firefox ESR

Fixed in:

68.7

macOS:14Firefox

Fixed in:

75

macOS:14Firefox ESR

Fixed in:

68.7

macOS:15Firefox

Fixed in:

75

macOS:15Firefox ESR

Fixed in:

68.7

macOS:26Firefox

Fixed in:

75

macOS:26Firefox ESR

Fixed in:

68.7

References

WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=1625404 ADVISORYhttps://usn.ubuntu.com/4335-1/ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2020-6821 WEBhttps://www.mozilla.org/security/advisories/mfsa2020-12/WEBhttps://www.mozilla.org/security/advisories/mfsa2020-13/WEBhttps://www.mozilla.org/security/advisories/mfsa2020-14/

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

NoneA:N

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

Timeline

PublishedApr 24, 2020

ModifiedAug 4, 2024

CVE-2020-6821 | Mondoo Vulnerability Intelligence