CVE-2021-23982
Mozilla: Internal network hosts could have been probed by a malicious webpage
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · March 23, 2021
Updated · November 22, 2025
Description
Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network's hosts as well as services running on the user's local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
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 3.0 · 6.1CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor