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MEDIUM

CVE-2021-28164

CVSS v3

5.3

MEDIUM

EPSS Score

82.4 %

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-webappMavenfrom 9.4.37 · fixed in 9.4.39

Vendor advisories

  • CVE-2021-28164 Red Hat Product Security39 products fixed · 50 known affected

    jetty: Ambiguous paths can access WEB-INF

    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-2022:6407 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Integration Camel-K 1.8 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-2021:3700 Red Hat Product Security1 product fixed

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

  • RHSA-2021:3225 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AMQ Streams 1.8.0 release and security update

3 more advisories

Full record on NVD

Description

In Eclipse Jetty 9.4.37.v20210219 to 9.4.38.v20210224, the default compliance mode allows requests with URIs that contain %2e or %2e%2e segments to access protected resources within the WEB-INF directory. For example a request to /context/%2e/WEB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

Technical details

Published
2021-04-01
Exploit-DB
EDB-50438

Frequently asked questions

What is CVE-2021-28164?

In Eclipse Jetty 9.4.37.v20210219 to 9.4.38.v20210224, the default compliance mode allows requests with URIs that contain %2e or %2e%2e segments to access protected resources within the WEB-INF directory. For example a request to /context/%2e/WEB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

Is CVE-2021-28164 actively exploited?

Active exploitation of CVE-2021-28164 has not been confirmed. Its EPSS score was 82.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-28164?

CVE-2021-28164 has a CVSS v3 base score of 5.3 (MEDIUM severity).

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