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CVE-2021-20293 RESTEasy

Affected softwareRESTEasy
Severity6.1 Medium CVSS 3.1 2 scores
WeaknessCross-site scripting (CWE-79)
Published10 Jun 2021
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.86% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory
Finding This CVE is MEDIUM severity, is not listed in CISA KEV or VulnCheck KEV, has no public exploit or PoC in any indexed source, carries no CISA Vulnrichment finding of a demonstrated exploit, and is not part of an Oracle Critical Patch Update. None of the signals that would put it in front of an engineer is present, and the volume of CVEs below that bar is too great to take one at a time, so no rule is written for it. This is a decision about what we act on, not a finding that the CVE is harmless — a patch may well be derivable, and a low-severity defect can still be one link in a longer chain.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=1942819 : a Red Hat bug: the triage, which links onward to the fix

CVSS

6.1 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 2 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.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary published
CVSS 2.0 4.3 none AV:N/AC:M/Au:N/C:N/I:P/A:N NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.jboss.resteasy:resteasy-bom 0 none 4.6.0.Final
org.jboss.resteasy:resteasy-core 0 none 4.6.0.Final

Products and versions

4 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd netapp oncommand insight generic any version
osv org.jboss.resteasy resteasy-bom generic ≤ 4.6.0
osv org.jboss.resteasy resteasy-core generic ≤ 4.6.0
nvd redhat resteasy generic ≤ 4.6.0

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=1942819 bugzilla
https://security.netapp.com/advisory/ntap-20210727-0005 WEB
https://security.netapp.com/advisory/ntap-20210727-0005/ Third Party Advisory

Timeline

Published2021-06-10By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.