CVE-2021-20253

Name: CVE-2021-20253
Creator: NVD / NIST
Published: 2021-03-09T18:15:15.157+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2021-20253 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. A flaw was found in ansible-tower. The default installation is vulnerable to Job Isolation escape allowing an attacker to elevate the privilege from a low privileged user to the awx user from outside the isolated environment. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

Description

A flaw was found in ansible-tower. The default installation is vulnerable to Job Isolation escape allowing an attacker to elevate the privilege from a low privileged user to the awx user from outside the isolated environment. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Metrics

CVSS 3.1

6.7/10

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

EPSS Probability

0.41%

32.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-552

Affected Software

Vendor	Product	Versions
Redhat	Ansible Tower	< 3.6.7
Redhat	Ansible Tower	>= 3.7.0, < 3.7.5
Redhat	Ansible Tower	>= 3.8.0, < 3.8.2

References

https://bugzilla.redhat.com/show_bug.cgi?id=1928847Issue Tracking, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1928847Issue Tracking, Vendor Advisory

Timeline

Published: Mar 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20253?

How severe is CVE-2021-20253?

CVE-2021-20253 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20253?

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-2021-20253?

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

Scan your code now

Source: NVD / NIST