CVE-2021-23937
DNS based denial of service in Apache Wicket
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.
How to fix CVE-2021-23937
To remediate CVE-2021-23937, upgrade the affected package to a fixed version below.
- —upgrade to 9.3.0 or later
Is CVE-2021-23937 being exploited?
Moderate — EPSS is 5.2%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- >= 9.0.0, < 9.3.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |