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CVE-2021-28164

MediumPublished

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...

Published: Apr 1, 2021
Updated: Aug 3, 2024
Assigning CNA: eclipse
Evidence observed: Oct 22, 2021

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

82.4%

High · next 30 days

Percentile: 99.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

-jettyCVE-2021-28164-PoC
Analysis and exploitation results for CVE-2021-28164 affecting Jetty web server, including vulnerability breakdown and demonstration.
Jetty 9.4.37.v20210219 - Information DisclosureExploit
Mayank Deshmukh · java · Oct 22, 2021

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