CVE-2021-23973
Mozilla: MediaError message property could have leaked information about cross-origin resources
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 23, 2021
Updated · November 22, 2025
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 score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-209 · Generation of Error Message Containing Sensitive Information