Vulnerability CVE-2021-23973
Published: 2021-02-26

Description:
When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

Type:

CWE-209

 (Information Exposure Through an Error Message)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Mozilla -> Firefox 
Mozilla -> Firefox esr 
Mozilla -> Thunderbird 
Debian -> Debian linux 

 References:
https://bugzilla.mozilla.org/show_bug.cgi?id=1690976
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
https://www.debian.org/security/2021/dsa-4866
https://www.mozilla.org/security/advisories/mfsa2021-07/
https://www.mozilla.org/security/advisories/mfsa2021-08/
https://www.mozilla.org/security/advisories/mfsa2021-09/
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