CVE-2021-28164

mediumpriority · attend · 60OT risk · highEPSS 0.824 · 100 %ileexploit · functionalDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

5 exploits · functional

Likely / severe?

82.4% (100th) EPSS

CVSS 5 · medium

Is it mine?

51 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · emo@eclipse.orgexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USCWE-200USCWE-200USCWE-551USCWE-551USCWE-863US

exploits (5)

Public proof-of-concept and weaponised exploit code.

auxiliary/gather/jetty_web_inf_disclosureJetty WEB-INF File Disclosurefunctional · metasploit
EDB-50438Jetty 9.4.37.v20210219 - Information DisclosurePoC · exploit_db
CyberCTF/vulhub-jetty-cve-2021-28164Vulhub jetty/CVE-2021-28164: Jetty Ambiguous Path Information Disclosure (CVE-2021-28164), run with IsoloomPoC · poc_in_github
Guanyu-Zhou/work1-apiWork 1 - secure Flask API, CI/CD, CVE-2021-28164PoC · poc_in_github
jammy0903/-jettyCVE-2021-28164-jetty /CVE-2021-28164/분석 및 결과PoC · poc_in_github

affected products (51)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Dell NetWorker <virtual 19.8.0.4all versionscert_bundDE
Dell NetWorker <virtual 19.9.0.2all versionscert_bundDE
Eclipse Jetty <9.4.39all versionscert_bundDE
IBM Business Automation Workflowall versionscert_bundDEcpe:/a:ibm:business_automation_workflow:-
IBM InfoSphere Information Server 11.7all versionscert_bundDEcpe:/a:ibm:infosphere_information_server:11.7
IBM Rational Change 5.3.2.4all versionscert_bundDEcpe:/a:ibm:rational_change:5.3.2.4
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Dell Networker< virtual 19.8.0.4cert_bundDE
Dell Networker< virtual 19.9.0.2cert_bundDE
Eclipse Jetty< 9.4.39cert_bundDE
The Eclipse Foundation Eclipse Jetty≤ unspecified ≤9.4.38.v20210224enisa_euvdEU
The Eclipse Foundation Eclipse Jetty9.4.37.v20210219 → unspecifiedenisa_euvdEU
Eclipse Foundation Jetty≤ 9.4.39fstec_bduRU
IBM Corp. IBM QRadar SIEM7.3 → 7.3.3 Fix Pack 12fstec_bduRU
IBM Corp. IBM QRadar SIEM7.4 → 7.4.3 Fix Pack 6fstec_bduRU
IBM Corp. IBM QRadar SIEM7.5 → 7.5.0 Update Pack 2fstec_bduRU
Oracle Corp. Autovue for Agile Product Lifecycle Management≤ 21.0.2fstec_bduRU
Oracle Corp. Oracle Banking APIs≤ 21.1fstec_bduRU

showing 20 of 51

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-1365Eclipse Jetty: Mehrere SchwachstellenDeutsch2021-04-05csaf · cert_bundDE
Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in Eclipse Jetty ausnutzen, um Informationen offenzulegen und einen Denial of Service Zustand auszulösen.
GHSA-v7ff-8wcx-gmc5Authorization Before Parsing and Canonicalization in jetty2021-04-06ghsa · osvUS
Release 9.4.37 introduced a more precise implementation of [RFC3986](https://tools.ietf.org/html/rfc3986#section-3.3) with regards to URI decoding, together with some new compliance modes to optionally allow support of some URI that may have ambiguous interpretation within the Servlet specified API methods behaviours. The default mode allowed % encoded . characters to be excluded for URI normalisation, which is correct by the RFC, but is not assumed by common Servlet implementations. 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. Workarounds found by HttpCompliance mode RFC7230_NO_AMBIGUOUS_URIS can be enabled by updating `start.d/http.ini` to include: jetty.http.compliance=RFC7230_NO_AMBIGUOUS_URIS.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund osv NVD CVE.org MITRE

published 2021-04-01modified 2026-06-17

references (106)

External citations — patches, advisories, analysis.

scry

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