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CVE-2021-28169

Quick assessment

Affected

The Eclipse Foundation Eclipse Jetty

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eclipse Jetty是Eclipse基金会的一个开源的、基于Java的Web服务器和Java Servlet容器。 Eclipse Jetty 中存在安全漏洞，该漏洞源于通过对ConcatServlet的双重编码路径请求访问WEB-INF目录中的受保护资源。以下产品及型号受到影响： Eclipse Jetty 9.4.40 版本及之前版本、Eclipse Jetty 10.0.2 版本及之前版本、Eclipse Jetty 11.0.2 版本及之前版本。

CVSS 5.3 · Medium EPSS 78.48% · P100 Updated Feb 25, 2026

Public Exploits 1

Nuclei · 1 CVE-2021-28169.yaml [template]

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

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I. Basic Information for CVE-2021-28169

Vulnerability Information

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Vulnerability Title

N/A

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

信息暴露

Source: CVE Program / CVE List V5

Vulnerability Title

Eclipse Jetty 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
The Eclipse Foundation	Eclipse Jetty	unspecified ~ 9.4.40	-

II. Public POCs for CVE-2021-28169

#	POC Description	Source Link	Shenlong Link
1	Eclipse Jetty through 9.4.40, through 10.0.2, and through 11.0.2 is susceptible to information disclosure. Requests to the ConcatServlet with a doubly encoded path can access protected resources within the WEB-INF directory, thus enabling an attacker to potentially obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-28169.yaml	POC Details
2	None	https://github.com/Threekiii/Awesome-POC/blob/master/%E4%B8%AD%E9%97%B4%E4%BB%B6%E6%BC%8F%E6%B4%9E/Jetty%20%E9%80%9A%E7%94%A8%20Servlets%20%E7%BB%84%E4%BB%B6%20ConcatServlet%20%E4%BF%A1%E6%81%AF%E6%B3%84%E9%9C%B2%E6%BC%8F%E6%B4%9E%20CVE-2021-28169.md	POC Details
3		https://github.com/vulhub/vulhub/blob/master/jetty/CVE-2021-28169/README.md	POC Details

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2021-28169

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Vendor Advisories for CVE-2021-28169 (6)

https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210727-0009/ x_refsource_CONFIRM
https://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-4949 vendor-advisory x_refsource_DEBIAN

Mailing List Discussions for CVE-2021-28169 (18)

https://lists.apache.org/thread.html/r8a1a332899a1f92c8118b0895b144b27a78e3f25b9d58a34dd5eb084%40%3Cnotifications.zookeeper.apache.org%3E x_refsource_MISC
https://lists.apache.org/thread.html/rbefa055282d52d6b58d29a79fbb0be65ab0a38d25f00bd29eaf5e6fd%40%3Cnotifications.zookeeper.apache.org%3E x_refsource_MISC
https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021/06/msg00017.html mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r29678972c3f8164b151fd7a5802785d402e530c09870a82ffc7681a4%40%3Cdev.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r04a4b4553a23aff26f42635a6ae388c3b162aab30a88d12e59d05168%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r91e34ff61aff8fd25a3f2a21539597c6ef7589a31c199b0a9546477c%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r234f6452297065636356f43654cdacef565b8f9ceb0e0c07ffb8c73b%40%3Cdev.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rb1292d30462b9baedea7c5d9594fc75990d9aa0ec223b48054ca9c25%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r33eb06b05afbc7df28d31055cae0cb3fd36cab808c884bf6d680bea5%40%3Cdev.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rfff6ff8ffb31e8a32619c79774def44b6ffbb037c128c5ad3eab7171%40%3Cissues.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r32b0b640ad2be3b858f0af51c68a7d5c5a66a462c8bbb93699825cd3%40%3Cissues.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rf36f1114e84a3379b20587063686148e2d5a39abc0b8a66ff2a9087a%40%3Cissues.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rddbb4f8d5db23265bb63d14ef4b3723b438abc1589f877db11d35450%40%3Cissues.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r284de9c5399486dfff12ab9e7323ca720dd7019a9a3e11c8510a7140%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rd5b52362f5edf98e0dcab6541a381f571cccc05ad9188e793af688f3%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r67c4f90658fde875521c949448c54c98517beecdc7f618f902c620ec%40%3Cissues.zookeeper.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/ref1c161a1621504e673f9197b49e6efe5a33ce3f0e6d8f1f804fc695%40%3Cjira.kafka.apache.org%3E mailing-list x_refsource_MLIST

https://www.cve.org/CVERecord?id=CVE-2021-28169

IV. Related Vulnerabilities

Same product: Eclipse Jetty

Same vendor: The Eclipse Foundation

Same weakness: CWE-200

V. Comments for CVE-2021-28169

No comments yet

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-28169

Quick assessment

Public Exploits 1

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2021-28169

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Shenlong Deep Dive — AI Deep Analysis

Affected Products

II. Public POCs for CVE-2021-28169

III. Intelligence Information for CVE-2021-28169

Vendor Advisories for CVE-2021-28169 (6)

Mailing List Discussions for CVE-2021-28169 (18)

IV. Related Vulnerabilities

V. Comments for CVE-2021-28169

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