Input validation error in Apache Wicket - CVE-2021-23937
Published: May 25, 2021
Vulnerability identifier: #VU53532
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-23937
CWE-ID: CWE-20
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 validation of user-supplied input in WebClientInfo when processing the "X-Forwarded-For" HTTP header. A remote attacker can force the server to initiate numerous DNS lookups and overload the internal DNS server.
Affected software
Apache Wicket
How to mitigate CVE-2021-23937
Install updates from vendor's website.
Apache Wicket - addressed in versions 7.18.0, 8.12.0, 9.3.0