Information Exposure Affecting org.eclipse.jetty:jetty-servlets package, versions [,9.4.41) [10.0.0, 10.0.3) [11.0.0,11.0.3)



    Attack Complexity Low

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.3% (67th percentile)
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5.3 medium
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6.5 medium
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Red Hat
5.3 medium

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  • published 9 Jun 2021
  • disclosed 9 Jun 2021
  • credit Unknown

How to fix?

Upgrade org.eclipse.jetty:jetty-servlets to version 9.4.41, 10.0.3, 11.0.3 or higher.


org.eclipse.jetty:jetty-servlets is an Utility Servlets from Jetty

Affected versions of this package are vulnerable to Information Exposure. Requests to the ConcatServlet and WelcomeFilter are able to access protected resources within the WEB-INF directory. For example, a request to the ConcatServlet with a URI of /concat?/%2557EB-INF/web.xml can retrieve the web.xml file.

This occurs because both ConcatServlet and WelcomeFilter decode the supplied path to verify it is not within the WEB-INF or META-INF directories. It then uses this decoded path to call RequestDispatcher which will also do decoding of the path. This double decoding allows paths with a doubly encoded WEB-INF to bypass this security check.