CVE-2021-21634

Credential disclosure via plaintext configuration storage

Published Mar 30, 2021 · Updated Aug 3, 2024

Cleartext credential storage in Jabber Plugin 1.41 and earlier allows local users to read passwords from the Jenkins controller file system. JabberPublisherDescriptor serializes configured XMPP passwords as ordinary XML text in hudson.plugins.jabber.im.transport.JabberPublisher.xml instead of using Jenkins Secret encryption. Access requires permission to read the controller file system, and exposure is limited to passwords saved in the plugin's global configuration.

CVSS severity6.5
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext credential storage in Jabber Plugin 1.41 and earlier allows local users to read passwords from the Jenkins controller file system. JabberPublisherDescriptor serializes configured XMPP passwords as ordinary XML text in hudson.plugins.jabber.im.transport.JabberPublisher.xml instead of using Jenkins Secret encryption. Access requires permission to read the controller file system, and exposure is limited to passwords saved in the plugin's global configuration.

The record

CVE
CVE-2021-21634
Published
Mar 30, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Jabber (XMPP) notifier and control
Classifications
CWE-522, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 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

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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 <=1.41

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Jenkins Project · Jabber (XMPP) notifier and controlversion=unspecified <=1.41

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1552.001Unsecured Credentials: Credentials In Files

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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