CVE-2021-20253

lowpriority · track · 37EPSS 0.004 · 35 %ileexploit · PoCDEEUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
0.41% (35th) EPSS
CVSS 3.5 · low
Is it mine?
13 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedansible-tower-37/ansible-tower-rhel7@sha256:728bcbeb14e0ea15a78fc5620075357758c79072e0378ec7d249d01aa966ed24_amd64 as a component of Red Hat Ansible Tower 3.7 for RHEL 7redhat_csaf

    For information on upgrading Ansible Tower, reference the Ansible Tower Upgrade and Migration Guide: https://docs.ansible.com/ansible-tower/latest/html/upgrade-migration-guide/index.html

    https://access.redhat.com/errata/RHSA-2021:0779
  • Fixedansible-tower-38/ansible-runner-rhel7@sha256:6208e426e90515de013194566833baad60f41df1052f25f45e55e8c0341ec62a_amd64 as a component of Red Hat Ansible Tower 3.8 for RHEL 7redhat_csaf

    For information on upgrading Ansible Tower, reference the Ansible Tower Upgrade and Migration Guide: https://docs.ansible.com/ansible-tower/latest/html/upgrade-migration-guide/index.html

    https://access.redhat.com/errata/RHSA-2021:0780
  • Fixedansible-tower-38/ansible-tower-rhel7@sha256:75e3ded9918cd3485fdd0e5b78006b08d9453eec304dfc5c635e5638bb77b0de_amd64 as a component of Red Hat Ansible Tower 3.8 for RHEL 7redhat_csaf

    For information on upgrading Ansible Tower, reference the Ansible Tower Upgrade and Migration Guide: https://docs.ansible.com/ansible-tower/latest/html/upgrade-migration-guide/index.html

    https://access.redhat.com/errata/RHSA-2021:0780
  • Workaroundansible-tower-37/ansible-tower-rhel7@sha256:728bcbeb14e0ea15a78fc5620075357758c79072e0378ec7d249d01aa966ed24_amd64 as a component of Red Hat Ansible Tower 3.7 for RHEL 7redhat_csaf

    Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

  • Workaroundansible-tower-38/ansible-runner-rhel7@sha256:6208e426e90515de013194566833baad60f41df1052f25f45e55e8c0341ec62a_amd64 as a component of Red Hat Ansible Tower 3.8 for RHEL 7redhat_csaf

    Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

  • Workaroundansible-tower-38/ansible-tower-rhel7@sha256:75e3ded9918cd3485fdd0e5b78006b08d9453eec304dfc5c635e5638bb77b0de_amd64 as a component of Red Hat Ansible Tower 3.8 for RHEL 7redhat_csaf

    Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–6.7

v2.03.5lowAV:L/AC:H/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 1.5 · impact 6.4
v3.16.7mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 0.8 · impact 5.9
v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)
v3.16.7mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Hsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-552USCWE-552US
04

exploits (1)

Public proof-of-concept and weaponised exploit code.

05

affected products (13)

Products and version ranges known to be affected.

06

advisories (3)

Vendor and ecosystem advisories describing this.

  • RHSA-2021:0779Red Hat Security Advisory: Red Hat Ansible Tower 3.7.5-1 - Container security and bug fix update2021-03-09csaf · redhat_csafUS

    Red Hat Ansible Tower 3.7.5-1 - RHEL7 Container Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  • RHSA-2021:0780Red Hat Security Advisory: Red Hat Ansible Tower 3.8.2-1 - Container security and bug fix update2021-03-09csaf · redhat_csafUS

    Red Hat Ansible Tower 3.8.2-1 - Container Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  • WID-SEC-W-2022-1352Ansible Tower: Mehrere SchwachstellenDeutsch2021-03-09csaf · cert_bundDE

    Ein lokaler oder entfernter Angreifer kann mehrere Schwachstellen in Ansible Tower ausnutzen, um Informationen offenzulegen oder seine Privilegien zu erweitern.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundnvdredhat_csafNVDCVE.orgMITRE
published 2021-03-09modified 2026-06-17
09

references (7)

External citations — patches, advisories, analysis.

scry

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