CVE-2021-4296

Name: CVE-2021-4296
Creator: NVD / NIST
Published: 2022-12-29T09:15:08.313+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2021-4296 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. The manipulation of the argument message leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 51f75c31f7fc33859a9a571311c67ae4e95d9c68. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217019.

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

0.52%

39.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
W3	Unicorn	< 2021-06-03

References

https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68Patch, Third Party Advisory
https://github.com/w3c/Unicorn/pull/212Third Party Advisory
https://vuldb.com/?ctiid.217019Third Party Advisory
https://vuldb.com/?id.217019Third Party Advisory
https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68Patch, Third Party Advisory
https://github.com/w3c/Unicorn/pull/212Third Party Advisory
https://vuldb.com/?ctiid.217019Third Party Advisory
https://vuldb.com/?id.217019Third Party Advisory

Timeline

Published: Dec 29, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4296?

How severe is CVE-2021-4296?

CVE-2021-4296 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4296?

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-2021-4296?

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

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Source: NVD / NIST