CVE-2021-21665Network attack vector

Credential theft via cross-site form-validation requests

Published Jun 10, 2021 · Updated Aug 3, 2024

CSRF in Jenkins Project XebiaLabs XL Deploy Plugin 10.0.1 and earlier allows remote attackers to capture stored credentials. The affected form-validation method accepts non-POST requests and connects to an attacker-chosen URL with a supplied Jenkins credentials ID. Exploitation requires user interaction and a credentials ID obtained through another method; the outbound connection discloses the selected username and password.

CVSS severity8.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Jenkins Project XebiaLabs XL Deploy Plugin 10.0.1 and earlier allows remote attackers to capture stored credentials. The affected form-validation method accepts non-POST requests and connects to an attacker-chosen URL with a supplied Jenkins credentials ID. Exploitation requires user interaction and a credentials ID obtained through another method; the outbound connection discloses the selected username and password.

The record

CVE
CVE-2021-21665
Published
Jun 10, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
XebiaLabs XL Deploy Plugin
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <=10.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · XebiaLabs XL Deploy Pluginversion=unspecified <=10.0.1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.0GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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