`CVE-2021-28164` Eclipse Jetty

Affected software	Eclipse Jetty
Severity	5.3 Medium CVSS 3.1 3 scores
Fixed in	`9.4.39`
Weakness	Incorrect authorization (CWE-863)
Published	1 Apr 2021
Updated	17 Jun 2026

Description

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.

CWE-200 · Information exposureCWE-551

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment no assessment published
Indexed PoC 4 indexed Published artifacts you can open, in Exploit-DB, GitHub PoC, Nuclei; first seen 2021-10-22.
EPSS 82% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.7% of all scored CVEs.

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	First seen
GitHub PoC	Vulhub jetty/CVE-2021-28164: Jetty Ambiguous Path Information Disclosure (CVE-2021-28164), run with Isoloom	2026-10-08
GitHub PoC	jetty /CVE-2021-28164/분석 및 결과	2023-10-31
Exploit-DB	Jetty 9.4.37.v20210219 - Information Disclosure	2021-10-22
Nuclei	Eclipse Jetty - Information Disclosure

Index

Artifact

Stars

First seen

GitHub PoC

Vulhub jetty/CVE-2021-28164: Jetty Ambiguous Path Information Disclosure (CVE-2021-28164), run with Isoloom

2026-10-08

GitHub PoC

jetty /CVE-2021-28164/분석 및 결과

2023-10-31

Exploit-DB

Jetty 9.4.37.v20210219 - Information Disclosure

2021-10-22

Nuclei

Eclipse Jetty - Information Disclosure

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Protection full
Action available security rule
Review human Researcher
Record active

Decided by	Manual classification of this CVE in the legacy dataset
Finding	A manual classification set this CVE's status to Protected by Waratek.

Decided by

Manual classification of this CVE in the legacy dataset

Finding

A manual classification set this CVE's status to Protected by Waratek.

How to mitigate CVE-2021-28164

Upgrade Eclipse Jetty to 9.4.39 or later. Until you can, Waratek RASP blocks exploitation with a security rule that blocks this kind of attack. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

5.3 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N emo@eclipse.org Secondary published

CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N NVD Primary

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:P/I:N/A:N NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`	emo@eclipse.org	Secondary	published
CVSS 3.1	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`	NVD	Primary
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:P/I:N/A:N`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update January 2022 ↗	CPU	2022-Q1	Oracle Financial Services Applications / Framework (Apache Ignite) (20.1, 21.1) Oracle Financial Services Applications / Framework (Apache Ignite) (20.1, 21.1)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update January 2022 ↗

CPU

2022-Q1

Oracle Financial Services Applications / Framework (Apache Ignite) (20.1, 21.1)
Oracle Financial Services Applications / Framework (Apache Ignite) (20.1, 21.1)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Financial Services Applications	Framework (Apache Ignite)	20.1, 21.1	20.1 · 21.1

Family

Component

Versions, as Oracle lists them

Read as

Oracle Financial Services Applications

Framework (Apache Ignite)

20.1, 21.1

20.1 · 21.1

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

org.eclipse.jetty:jetty-webapp 9.4.37 9.4.39 unbounded

Package	Introduced	Fixed	Last affected
`org.eclipse.jetty:jetty-webapp`	9.4.37	`9.4.39`	unbounded

Products and versions

18 products, 21 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	eclipse	jetty	generic	9.4.37:20210219 · 9.4.38:20210224
nvd	netapp	cloud manager	generic	any version
nvd	netapp	e-series performance analyzer	generic	any version
nvd	netapp	e-series santricity os controller	generic	≥ 11.0 and ≤ 11.70.1
nvd	netapp	e-series santricity web services	generic	any version
nvd	netapp	element plug-in for vcenter server	generic	any version
nvd	netapp	santricity cloud connector	generic	any version
nvd	netapp	snapcenter	generic	any version
nvd	netapp	snapcenter plug-in	generic	any version
nvd	netapp	storage replication adapter for clustered data ontap	generic	≥ 9.6
nvd	netapp	vasa provider for clustered data ontap	generic	≥ 9.6
nvd	netapp	virtual storage console	generic	≥ 9.6
nvd	oracle	autovue for agile product lifecycle management	generic	21.0.2
nvd	oracle	banking apis	generic	20.1 · 21.1
nvd	oracle	banking digital experience	generic	20.1 · 21.1
nvd	oracle	communications session route manager	generic	≥ 8.0.0 and ≤ 8.2.4
nvd	oracle	siebel core - automation	generic	≤ 21.9
osv	org.eclipse.jetty	jetty-webapp	generic	≥ 9.4.37 and ＜ 9.4.39

Source

Vendor

Product

Scheme

Affected versions

nvd

eclipse

jetty

generic

9.4.37:20210219 · 9.4.38:20210224

nvd

netapp

cloud manager

generic

any version

nvd

netapp

e-series performance analyzer

generic

any version

nvd

netapp

e-series santricity os controller

generic

≥ 11.0 and ≤ 11.70.1

nvd

netapp

e-series santricity web services

generic

any version

nvd

netapp

element plug-in for vcenter server

generic

any version

nvd

netapp

santricity cloud connector

generic

any version

nvd

netapp

snapcenter

generic

any version

nvd

netapp

snapcenter plug-in

generic

any version

nvd

netapp

storage replication adapter for clustered data ontap

generic

≥ 9.6

nvd

netapp

vasa provider for clustered data ontap

generic

≥ 9.6

nvd

netapp

virtual storage console

generic

≥ 9.6

nvd

oracle

autovue for agile product lifecycle management

generic

21.0.2

nvd

oracle

banking apis

generic

20.1 · 21.1

nvd

oracle

banking digital experience

generic

20.1 · 21.1

nvd

oracle

communications session route manager

generic

≥ 8.0.0 and ≤ 8.2.4

nvd

oracle

siebel core - automation

generic

≤ 21.9

osv

org.eclipse.jetty

jetty-webapp

generic

≥ 9.4.37 and ＜ 9.4.39

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** HTTP, NO AUTH REMOTE EXPLOIT, FRAMEWORK (APACHE IGNITE) **Products:** ORACLE BANKING APIS, ORACLE FINANCIAL SERVICES APPLICATIONS, ORACLE BANKING DIGITAL EXPERIENCE

References

URL	Tags
https://github.com/eclipse/jetty.project/security/advisories/GHSA-v7ff-8wcx-gmc5	WEB
https://www.oracle.com/security-alerts/cpuoct2021.html	WEB
https://www.oracle.com/security-alerts/cpujan2022.html	WEB
https://www.oracle.com/security-alerts/cpuapr2022.html	WEB
https://security.netapp.com/advisory/ntap-20210611-0006	WEB
https://lists.apache.org/thread.html/rd7c8fb305a8637480dc943ba08424c8992dccad018cd1405eb2afe0e@%3Cdev.ignite.apache.org%3E	WEB
https://lists.apache.org/thread.html/rd0471252aeb3384c3cfa6d131374646d4641b80dd313e7b476c47a9c@%3Cissues.solr.apache.org%3E	WEB
https://lists.apache.org/thread.html/rcea249eb7a0d243f21696e4985de33f3780399bf7b31ea1f6d489b8b@%3Cissues.zookeeper.apache.org%3E	WEB
https://lists.apache.org/thread.html/rbc075a4ac85e7a8e47420b7383f16ffa0af3b792b8423584735f369f@%3Cissues.solr.apache.org%3E	WEB
https://lists.apache.org/thread.html/r9974f64723875052e02787b2a5eda689ac5247c71b827d455e5dc9a6@%3Cissues.solr.apache.org%3E	WEB

URL

Timeline

Published	2021-04-01	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2021-04-01

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (5 of 24 rules ran)

5 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification decided it matched Protected by Waratek Found in legacy manual classifications

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

NVD ↗ · CVE.org ↗