NULL pointer dereference in varnish-modules - CVE-2021-28543
Published: May 28, 2025
Vulnerability identifier: #VU109906
CSH Severity: Medium
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-2021-28543
CWE-ID: CWE-476
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 a NULL pointer dereference error when processing headers. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
varnish-modules
Fedora
varnish-modules
Fedora
varnish-modules
How to mitigate CVE-2021-28543
Install update from vendor's website.
varnish-modules - update to 0.17.0
varnish-modules - update to 0.17.1-1.fc34
varnish-modules - update to 0.17.1-1.fc34