CVE-2021-20293

mediumpriority · track · 24EPSS 0.009 · 58 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.86% (58th) EPSS

CVSS 4.3 · medium

Is it mine?

7 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

A reflected Cross-Site Scripting (XSS) flaw was found in RESTEasy in all versions of RESTEasy up to 4.6.0.Final, where it did not properly handle URL encoding when calling @javax.ws.rs.PathParam without any @Produces MediaType. This flaw allows an attacker to launch a reflected XSS attack. The highest threat from this vulnerability is to data confidentiality and integrity.

cvss

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

6.1

010

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

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79US

affected products (7)

Products and version ranges known to be affected.

Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
n/a RESTEasy≤ All versions of RESTEasy up to 4.6.0.Finalenisa_euvdEU
netapp oncommand insightall versionsnvdUScpe:2.3:a:netapp:oncommand_insight:*:*:*:*:*:*:*:*
redhat resteasy≤ 4.6.0nvdUScpe:2.3:a:redhat:resteasy:*:*:*:*:*:*:*:*
Maven org.jboss.resteasy:resteasy-bom≤ 4.6.0.FinalosvUSpkg:maven/org.jboss.resteasy/resteasy-bom
Maven org.jboss.resteasy:resteasy-core≤ 4.6.0.FinalosvUSpkg:maven/org.jboss.resteasy/resteasy-core

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-1366Red Hat Integration - Service Registry: Mehrere SchwachstellenDeutsch2021-11-02csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Integration - Service Registry ausnutzen, um Informationen offenzulegen und einen Cross Site Scripting Angriff durchzuführen.
GHSA-5h26-c766-g93vCross-Site Scripting2021-06-15ghsa · osvUS
A reflected Cross-Site Scripting (XSS) flaw was found in RESTEasy in all versions of RESTEasy up to 4.6.0.Final, where it did not properly handle URL encoding when calling @javax.ws.rs.PathParam without any @Produces MediaType. This flaw allows an attacker to launch a reflected XSS attack. The highest threat from this vulnerability is to data confidentiality and integrity.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2021-06-10modified 2026-06-17

references (12)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan