CVE-2021-21659
HighXXE vulnerability in Jenkins URLTrigger Plugin
Published May 24, 2022 · Updated Jul 9, 2026 · Also known as GHSA-34j5-c4cv-mmg5
Key Facts
Patch immediately- CVE-2021-21659 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting Urltrigger (Jenkins), org.jenkins-ci.plugins:urltrigger (maven), Jenkins URLTrigger Plugin.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 67% probability of exploitation in the next 30 days.
- Fixed versions are available, including Urltrigger <=0.48, org.jenkins-ci.plugins:urltrigger 0.49, Urltrigger 0.48.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
8.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS (30-day exploit likelihood)
67%
Higher than 99.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2021-21659 brief as a PDF
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Description
Jenkins URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| UrltriggerJenkins | See advisory | 0.48 |
| org.jenkins-ci.plugins:urltriggermaven | See advisory | 0.49 |
| Jenkins URLTrigger Plugin | >= unspecified | n/a |
Patched Releases
Urltrigger
<=0.48
org.jenkins-ci.plugins:urltrigger
0.49
Timeline
Publicly disclosed
May 24, 2022
Last updated
Jul 9, 2026
Weakness Type
- CWE-611 Improper Restriction of XML External Entity Reference
References
- advisoryGHSA advisory
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2021-21659
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21657
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21658
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21659
FAQ
Common Questions.
Jenkins URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
Affected: Urltrigger (Jenkins); org.jenkins-ci.plugins:urltrigger (maven); Jenkins URLTrigger Plugin versions >= unspecified. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Urltrigger <=0.48, org.jenkins-ci.plugins:urltrigger 0.49, Urltrigger 0.48.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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