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MEDIUM

CVE-2021-28169

CVSS v3

5.3

MEDIUM

EPSS Score

78.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • org.eclipse.jetty:jetty-servletsMavenfrom 11.0.0 · fixed in 11.0.3

Vendor advisories

  • CVE-2021-28169 Red Hat Product Security7 products fixed · 48 known affected

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

    jetty-annotations as a component of Red Hat Enterprise Linux 7 · jetty-ant as a component of Red Hat Enterprise Linux 7 · jetty-client as a component of Red Hat Enterprise Linux 7

  • RHSA-2022:7257 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel-K 1.8.1 security update

  • RHSA-2021:5134 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.10.0 release and security update

  • RHSA-2021:4767 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel Extensions for Quarkus GA security update

  • RHSA-2021:3758 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.9.0 packages and security update

  • RHSA-2021:3700 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AMQ Broker 7.9.0 release and security update

1 more advisory

Full record on NVD

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.

Technical details

Published
2021-06-09

Frequently asked questions

What is CVE-2021-28169?

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.

Is CVE-2021-28169 actively exploited?

Active exploitation of CVE-2021-28169 has not been confirmed. Its EPSS score was 78.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-28169?

CVE-2021-28169 has a CVSS v3 base score of 5.3 (MEDIUM severity).

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