AUGUST 4, 2026
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Case File

CVE-2021-23937

HIGH · CVSS 7.5 EPSS 4.26%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-05-25 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.5. It affects Apache. It may lead to a denial-of-service condition.

CVE
CVE-2021-23937
Severity
HIGH
CVSS
7.5
EPSS
4.26%
Apache

Original NVD Description

A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions.

Related CVEs

Other vulnerabilities affecting the same vendor(s)