CVE-2021-21680Network attack vector

Secret disclosure or SSRF via external entities

Published Aug 31, 2021 · Updated Aug 3, 2024

XXE in Jenkins Project Nested View Plugin 1.20 and earlier allows remote authenticated users to extract secrets or trigger SSRF. NestedView.updateByXml creates a default TransformerFactory and transforms attacker-controlled view XML without blocking external DTDs or stylesheets. View configuration permission is required; exploitation reads controller-accessible data or makes controller-originated requests.

CVSS severity7.1
High
EPSS probability1.32%
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 Jenkins Project Nested View Plugin 1.20 and earlier allows remote authenticated users to extract secrets or trigger SSRF. NestedView.updateByXml creates a default TransformerFactory and transforms attacker-controlled view XML without blocking external DTDs or stylesheets. View configuration permission is required; exploitation reads controller-accessible data or makes controller-originated requests.

The record

CVE
CVE-2021-21680
Published
Aug 31, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Jenkins Nested View Plugin
Classifications
CWE-611, T1212
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 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 <=1.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Jenkins Nested View Pluginversion=unspecified <=1.20

Published CVSS scores

5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
7.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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
T1212Exploitation for Credential Access

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