What’s Vulnerable › Vulnerabilities

CVE-2021-28169

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 78.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-09 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• Debian Linux: 9.0, 10.0
• The Eclipse Foundation Eclipse Jetty: before 9.4.41; from 10.0.0 before 10.0.3; from 11.0.0 before 11.0.3 — fixed in 10.0.3, 11.0.3, 9.4.41
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Hci: all versions
• NetApp Management Services For Element Software: all versions
• NetApp Snap Creator Framework: all versions
• Oracle Communications Cloud Native Core Policy: 1.14.0
• Oracle Corporation Oracle REST Data Services: before 21.3 — fixed in 21.3

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Jetty 10.0.3, 11.0.3, 9.4.41; Oracle Corporation Oracle REST Data Services 21.3. Check the vendor advisory for mitigations.

References

• https://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq
• https://lists.apache.org/thread.html/r04a4b4553a23aff26f42635a6ae388c3b162aab30a88d12e59d05168%40%3Cjira.kafka.apache.org%3E
• https://lists.apache.org/thread.html/r234f6452297065636356f43654cdacef565b8f9ceb0e0c07ffb8c73b%40%3Cdev.kafka.apache.org%3E
• https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E
• https://lists.apache.org/thread.html/r284de9c5399486dfff12ab9e7323ca720dd7019a9a3e11c8510a7140%40%3Cjira.kafka.apache.org%3E
• https://lists.apache.org/thread.html/r29678972c3f8164b151fd7a5802785d402e530c09870a82ffc7681a4%40%3Cdev.kafka.apache.org%3E
• https://lists.apache.org/thread.html/r32b0b640ad2be3b858f0af51c68a7d5c5a66a462c8bbb93699825cd3%40%3Cissues.zookeeper.apache.org%3E
• https://lists.apache.org/thread.html/r33eb06b05afbc7df28d31055cae0cb3fd36cab808c884bf6d680bea5%40%3Cdev.zookeeper.apache.org%3E
• https://lists.apache.org/thread.html/r67c4f90658fde875521c949448c54c98517beecdc7f618f902c620ec%40%3Cissues.zookeeper.apache.org%3E
• https://lists.apache.org/thread.html/r8a1a332899a1f92c8118b0895b144b27a78e3f25b9d58a34dd5eb084%40%3Cnotifications.zookeeper.apache.org%3E
• https://lists.apache.org/thread.html/r91e34ff61aff8fd25a3f2a21539597c6ef7589a31c199b0a9546477c%40%3Cjira.kafka.apache.org%3E
• https://lists.apache.org/thread.html/rb1292d30462b9baedea7c5d9594fc75990d9aa0ec223b48054ca9c25%40%3Cjira.kafka.apache.org%3E

Get alerted when CVE-2021-28169 or the next vulnerability affects your stack