CVE-2021-39133Network attack vector

Code execution via tokenless plugin installation requests

Published Aug 30, 2021 · Updated Aug 4, 2024

CSRF in PagerDuty Rundeck before 3.3.14 and 3.4.0 through 3.4.2 allows remote attackers to run untrusted code through an administrator. The PluginController uploadPlugin and installPlugin endpoints accepted session-authenticated POST requests without validating a form token. Exploitation requires a logged-in user with admin access to the system resource to follow an untrusted link; the server can install attacker-supplied plugin code.

CVSS severity6.8
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in PagerDuty Rundeck before 3.3.14 and 3.4.0 through 3.4.2 allows remote attackers to run untrusted code through an administrator. The PluginController uploadPlugin and installPlugin endpoints accepted session-authenticated POST requests without validating a form token. Exploitation requires a logged-in user with admin access to the system resource to follow an untrusted link; the server can install attacker-supplied plugin code.

The record

CVE
CVE-2021-39133
Published
Aug 30, 2021
Updated
Aug 4, 2024
Vendor
PagerDuty
Product
Rundeck
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 3.3.14
  2. Affected versionversion=>= 3.4.0, < 3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

PagerDuty · Rundeckversion=< 3.3.14; version=>= 3.4.0, < 3.4.3

Published CVSS scores

6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
6.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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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