Medium severity · published Feb 26, 2021
CVE-2021-23973
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…
6.5
CVSS
1.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 86.0 · source: NVD
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.8 · source: NVD
TH
Thunderbird · Mozilla
before 78.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23973
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-23973
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1690976
Mailing List
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
Third Party Advisory
https://security.gentoo.org/glsa/202104-09
Third Party Advisory
https://security.gentoo.org/glsa/202104-10
Third Party Advisory
https://www.debian.org/security/2021/dsa-4866
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-07/
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