CVE-2021-21672Network attack vector

Secret extraction and SSRF via external entities

Published Jun 30, 2021 · Updated Aug 3, 2024

XXE in the report parser of Jenkins Selenium HTML report Plugin 1.0 and earlier allows attackers to extract controller secrets or cause SSRF. TestResult.parseFor creates a SAXParserFactory without disabling external general entities or rejecting DOCTYPE declarations, so crafted report HTML resolves attacker-supplied entities. Exploitation requires control of a Selenium report file parsed by a configured post-build action; impact is limited to secret extraction and controller-originated requests.

CVSS severity4.3
Medium
EPSS probability42.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

XXE in the report parser of Jenkins Selenium HTML report Plugin 1.0 and earlier allows attackers to extract controller secrets or cause SSRF. TestResult.parseFor creates a SAXParserFactory without disabling external general entities or rejecting DOCTYPE declarations, so crafted report HTML resolves attacker-supplied entities. Exploitation requires control of a Selenium report file parsed by a configured post-build action; impact is limited to secret extraction and controller-originated requests.

The record

CVE
CVE-2021-21672
Published
Jun 30, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Selenium HTML report
Classifications
CWE-611, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Selenium HTML reportversion=unspecified <=1.0

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo