CVE-2023-28427
Mozilla: Matrix SDK bundled with Thunderbird vulnerable to denial-of-service attack
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 28, 2023
Updated · November 22, 2025
Description
The Mozilla Foundation Security Advisory describes this flaw as:
Thunderbird users who use the Matrix chat protocol were vulnerable to a denial-of-service attack.
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
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 · 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')