CVE-2021-21676Network attack vector

Unauthorized test emails via unchecked HTTP endpoint

Published Jun 30, 2021 · Updated Aug 3, 2024

Missing authorization in Jenkins Requests Plugin 2.2.7 and earlier allows remote authenticated users to send test emails to any address. The plugin exposes a test-email HTTP endpoint without checking Overall/Administer permission; the public advisory does not identify the handler or disclose a patch diff. Overall/Read access and working outbound mail configuration are required, and the bounded effect is unauthorized email delivery rather than Jenkins data access or code execution.

CVSS severity4.3
Medium
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Jenkins Requests Plugin 2.2.7 and earlier allows remote authenticated users to send test emails to any address. The plugin exposes a test-email HTTP endpoint without checking Overall/Administer permission; the public advisory does not identify the handler or disclose a patch diff. Overall/Read access and working outbound mail configuration are required, and the bounded effect is unauthorized email delivery rather than Jenkins data access or code execution.

The record

CVE
CVE-2021-21676
Published
Jun 30, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Jenkins Requests Plugin
Classifications
CWE-862
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

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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 <=2.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Jenkins Requests Pluginversion=unspecified <=2.2.7

Published CVSS scores

4.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/C:N/I:P/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

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

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Your stack

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