CVE-2021-21658

Name: CVE-2021-21658
Creator: NVD / NIST
Published: 2021-05-25T17:15:08.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.54%

Last modified Jun 17, 2026

CVE-2021-21658 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.. EPSS estimates a 1.54% chance of exploitation in the next 30 days.

Description

Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.54%

71.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Jenkins	Nuget	<= 1.0

References

http://www.openwall.com/lists/oss-security/2021/05/25/3Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2340Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/05/25/3Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2340Vendor Advisory

Timeline

Published: May 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21658?

Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

How severe is CVE-2021-21658?

CVE-2021-21658 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21658?

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-2021-21658?

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

Scan your code now

Source: NVD / NIST