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CVE-2021-28169

jetty: requests to the ConcatServlet and WelcomeFilter are able to access protected resources within the WEB-INF directory

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · June 8, 2021

Updated · October 12, 2026

Description

For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, it is possible for requests to the ConcatServlet with a doubly encoded path to access protected resources within the WEB-INF directory. For example a request to /concat?/%2557EB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

Statement

In OpenShift Container Platform (OCP), the hive/presto/hadoop components that comprise the OCP metering stack, ship the vulnerable version of jetty. Since the release of OCP 4.6, the metering product has been deprecated [1], hence the affected components are marked as wontfix. This may be fixed in the future.

[1] https://docs.openshift.com/container-platform/4.6/release_notes/ocp-4-6-release-notes.html#ocp-4-6-metering-operator-deprecated

Red Hat OpenStack Platform's OpenDaylight will not be updated for this flaw because it was deprecated as of OpenStack Platform 14 and is only receiving security fixes for Important and Critical flaws.

Red Hat CodeReady Studio 12 is not affected by this flaw because it does not ship the vulnerable components (ConcatServlet or WelcomeFilter) of jetty.

Red Hat Enterprise Linux 8 is not affected by this flaw because it does not ship the vulnerable components (ConcatServlet or WelcomeFilter) of jetty.

Red Hat Enterprise Linux 7 ships the vulnerable component of jetty, but only in the optional repository and thus this flaw is out of support scope for Red Hat Enterprise Linux 7.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor