CVE-2021-20293

Name: CVE-2021-20293
Creator: NVD / NIST
Published: 2021-06-10T12:15:07.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2021-20293 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.86%

53.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Redhat	Resteasy	<= 4.6.0
Netapp	Oncommand Insight	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1942819Issue Tracking, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210727-0005/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1942819Issue Tracking, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210727-0005/Third Party Advisory

Timeline

Published: Jun 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20293?

How severe is CVE-2021-20293?

CVE-2021-20293 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20293?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20293?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST