Denial of Service (DoS) Affecting org.apache.wicket:wicket-core package, versions [9.0.0,9.3.0) [8.0.0,8.12.0) [6.2.0,7.18.0)

  • Attack Complexity


  • Availability


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  • snyk-id


  • published

    26 May 2021

  • disclosed

    26 May 2021

  • credit

    Jonathan Juursema of Topicus.Healthcare

How to fix?

Upgrade org.apache.wicket:wicket-core to version 9.3.0, 8.12.0, 7.18.0 or higher.


org.apache.wicket:wicket-core is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

Affected versions of this package are vulnerable to Denial of Service (DoS). A DNS proxy and possible amplification attack vulnerability in WebClientInfo 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.


Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package