CVE-2021-20293
Cross-Site Scripting
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-20293- 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 - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-20293- Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-1269 No score
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.
- Record
EUVD-2021-1269- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5h26-c766-g93v
Cross-Site Scripting
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.
- Record
GHSA-5h26-c766-g93v- 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 - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-20293- 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 - Updated
- 2026-11-02
OSVGHSA-5h26-c766-g93v
Cross-Site Scripting
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.
- Record
GHSA-5h26-c766-g93v- 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 - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-20293
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.
- Record
UBUNTU-CVE-2021-20293- 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 - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.jboss.resteasy:resteasy-bomMaven |
through 4.6.0.Final | None known |
org.jboss.resteasy:resteasy-coreMaven |
through 4.6.0.Final | None known |
org.jboss.resteasy:resteasy-bomMaven |
through 4.6.0.Final, plus listed versions 1.2.1.GA1.2.GA2.0-RC12.0-beta-12.0-beta-2 Show 45 moreShow less2.0-beta-32.0-beta-42.0.0.GA2.0.1.GA2.1-beta-12.1.0.GA2.2-RC-12.2-beta-12.2.0.GA2.2.1.GA2.2.2.GA2.2.3.GA2.3-RC12.3-beta-12.3.0.GA2.3.1.GA2.3.10.Final2.3.2.Final2.3.3.Final2.3.4.Final2.3.5.Final2.3.6.Final2.3.7.Final3.0-beta-13.0-beta-23.0-beta-33.0-beta-43.0-beta-53.0-beta-63.0-rc-13.0.0.Final3.0.1.Final3.0.10.Final3.0.11.Final3.0.12.Final3.0.13.Final3.0.14.Final3.0.15.Final3.0.16.Final3.0.17.Final3.0.18.Final3.0.19.Final3.0.2.Final3.0.20.Final3.0.21.Final |
None known |
org.jboss.resteasy:resteasy-coreMaven |
through 4.6.0.Final, plus listed versions 4.0.0.Beta64.0.0.Beta74.0.0.Beta84.0.0.CR14.0.0.CR2 Show 27 moreShow less4.0.0.CR34.0.0.Final4.1.0.Final4.1.1.Final4.2.0.Final4.3.0.Final4.3.1.Final4.4.0.CR14.4.0.Final4.4.1.Final4.4.2.Final4.4.3.Final4.5.0.Final4.5.1.Final4.5.10.Final4.5.11.Final4.5.12.Beta14.5.12.Final4.5.2.Final4.5.3.Final4.5.4.Final4.5.5.Final4.5.6.Final4.5.7.Final4.5.8.Final4.5.8.SP14.5.9.Final |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20293 is a medium vulnerability (CVSS 6.1) in Red Hat Resteasy, published June 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.86%, the 58th percentile. No source names a fixed version.
References
Left out here: 104 versions. The JSON record has them.