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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Eclipse Foundation | Eclipse Jetty | unspecified – ≤ 9.4.40, unspecified – ≤ 10.0.2, unspecified – ≤ 11.0.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | jetty9 | 9.4.39-2 | — |
| Debian 13 | jetty9 | 9.4.39-2 | — |
| Debian 12 | jetty9 | 9.4.39-2 | — |
| Debian 10 | jetty9 | 9.4.16-0+deb10u1 | DSA-4949-1 |
| Debian 9 | jetty9 | 9.2.30-0+deb9u2 | DLA-2688-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | jetty9 | No fix yet | — |
| Ubuntu 18.04 LTS | jetty9 | No fix yet | — |
| Ubuntu 16.04 LTS | jetty +2 | No fix yet | — |
| Ubuntu 14.04 LTS | jetty +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenShift 4 | coreos-installer +1 | 0.10.0-2.rhaos4.9.el8 | RHSA-2021:3758 |
| Red Hat OpenShift 4 | jenkins | 2.289.3.1630554997-1.el8 | RHSA-2021:3758 |
| Red Hat OpenShift 4 | openshift +1 | 4.9.0-202110080828.p0.git.894a78b.assembly.stream.el7 | RHSA-2021:3758 |
| Red Hat OpenShift 4 | openvswitch2.15 +5 | 2.15.0-28.el8fdp | RHSA-2021:3758 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | jetty-minimal | 9.4.42-3.9.1 | SUSE-SU-2021:2005-1 |
| SLES 15 SP2 | jetty-minimal | 9.4.42-3.9.1 | SUSE-SU-2021:2005-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | jetty-minimal +1 | 9.4.42-3.9.1 | openSUSE-SU-2021:2005-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | jetty-io +35 | 9.0.3-8.amzn2.0.1 | ALAS2-2024-2408 |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Eclipse Jetty ConcatServlet - Information Disclosure http/cves/2021/CVE-2021-28169.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.eclipse.jetty:jetty-servlets | < 9.4.41 | 9.4.41 | GHSA-gwcr-j4wh-j3cq |
| Maven | org.eclipse.jetty:jetty-servlets | >= 10.0.0, < 10.0.3 | 10.0.3 | GHSA-gwcr-j4wh-j3cq |
| Maven | org.eclipse.jetty:jetty-servlets | >= 11.0.0, < 11.0.3 | 11.0.3 | GHSA-gwcr-j4wh-j3cq |
Advisories 10
- RHSA-2021:3758 Red Hat Security Advisory: OpenShift Container Platform 4.9.0 packages and security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- DSA-4949-1 jetty9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2688-1 jetty9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:2005-1 Security update for jetty-minimal SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2005-1 Security update for jetty-minimal SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1595 Eclipse Jetty: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · May 29, 2025
- ALAS2-2024-2408 Moderate: jetty security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 9, 2024
- WID-SEC-2022-0616 IBM Tivoli Network Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 23, 2023
References
- https://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq
- [kafka-users] 20210617 vulnerabilities mailing-list
- [debian-lts-announce] 20210617 [SECURITY] [DLA 2688-1] jetty9 security update mailing-list
- [kafka-jira] 20210623 [GitHub] [kafka] dongjinleekr opened a new pull request #10919: KAFKA-12985: CVE-2021-28169 - Upgrade jetty to 9.4.41 mailing-list
- [kafka-dev] 20210623 [jira] [Created] (KAFKA-12985) CVE-2021-28169 - Upgrade jetty to 9.4.41 mailing-list
- [kafka-jira] 20210623 [jira] [Created] (KAFKA-12985) CVE-2021-28169 - Upgrade jetty to 9.4.41 mailing-list
- [kafka-jira] 20210704 [GitHub] [kafka] ijuma commented on pull request #10919: KAFKA-12985: CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [kafka-jira] 20210704 [GitHub] [kafka] ijuma merged pull request #10919: KAFKA-12985: CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [kafka-dev] 20210722 [jira] [Resolved] (KAFKA-12985) CVE-2021-28169 - Upgrade jetty to 9.4.41 mailing-list
- [kafka-jira] 20210722 [jira] [Updated] (KAFKA-12985) CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [kafka-jira] 20210722 [jira] [Resolved] (KAFKA-12985) CVE-2021-28169 - Upgrade jetty to 9.4.41 mailing-list
- DSA-4949 vendor-advisory
- [zookeeper-issues] 20210928 [jira] [Updated] (ZOOKEEPER-4390) CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [zookeeper-issues] 20210928 [jira] [Created] (ZOOKEEPER-4390) CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [zookeeper-issues] 20210928 [jira] [Updated] (ZOOKEEPER-4390) CVE-2021-28169 , - Upgrade jetty to 9.4.42 mailing-list
- [zookeeper-issues] 20210928 [jira] [Updated] (ZOOKEEPER-4390) CVE-2021-28169 , CVE-2021-28163, - Upgrade jetty to 9.4.42 mailing-list
- [zookeeper-dev] 20210928 [jira] [Created] (ZOOKEEPER-4390) CVE-2021-28169 - Upgrade jetty to 9.4.42 mailing-list
- [zookeeper-issues] 20210928 [jira] [Updated] (ZOOKEEPER-4390) CVE-2021-28169 , CVE-2021-28163, CVE-2021-34428- Upgrade jetty to 9.4.42 mailing-list
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://lists.apache.org/thread.html/r8a1a332899a1f92c8118b0895b144b27a78e3f25b9d58a34dd5eb084%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rbefa055282d52d6b58d29a79fbb0be65ab0a38d25f00bd29eaf5e6fd%40%3Cnotifications.zookeeper.apache.org%3E
- https://security.netapp.com/advisory/ntap-20210727-0009/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html