Inefficient regular expression complexity in Semver-regex - CVE-2021-3795
Published: May 14, 2025
Vulnerability identifier: #VU109182
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-3795
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.
Affected software
Semver-regex
Red Hat Advanced Cluster Management for Kubernetes
QRadar Assistant
Red Hat Advanced Cluster Management for Kubernetes
QRadar Assistant
How to mitigate CVE-2021-3795
Install updates from vendor's website.
Semver-regex - update to 3.1.3
Red Hat Advanced Cluster Management for Kubernetes - update to 2.2.10
QRadar Assistant - update to 3.6.0
Red Hat Advanced Cluster Management for Kubernetes - update to 2.2.10
QRadar Assistant - update to 3.6.0