CVE-2021-3583

Name: CVE-2021-3583
Creator: NVD / NIST
Published: 2021-09-22T12:15:07.953+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.85%

Last modified Jun 17, 2026

CVE-2021-3583 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

Description

A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.85%

53.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Ansible Automation Platform	1.2
Redhat	Ansible Engine	< 2.9.23
Redhat	Ansible Tower	< 3.7.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1968412Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/12/msg00018.html
https://bugzilla.redhat.com/show_bug.cgi?id=1968412Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/12/msg00018.html

Timeline

Published: Sep 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3583?

How severe is CVE-2021-3583?

CVE-2021-3583 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3583?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3583?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST