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Vulnerabilities

Vulnerability · CVE-2020-1733

A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user.

Published Mar 11, 2020 · catalog updated Jun 17, 2026 · A race condition flaw

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-1733. EPSS is 0.40%. Act only if a listed version of A race condition flaw is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A race condition flaw).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Version ranges on file
Affected products
cpe redhat/ansible · cpe redhat/ansible tower

A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p "; this operation does not fail if the directory already exists and is owned by another user. An attacker could take advantage to gain control of the become user as the target directory can be retrieved by iterating '/proc/ /cmdline'.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/ansible< 2.8.8
  • cpe redhat/ansible<= 2.7.16
  • cpe redhat/ansible>= 2.9.0, <= 2.9.5
  • cpe redhat/ansible tower<= 3.3.4
  • cpe redhat/ansible tower>= 3.3.5, <= 3.4.5
  • cpe redhat/ansible tower>= 3.5.0, <= 3.5.5

How to fix CVE-2020-1733

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-1733. EPSS is 0.40%. Act only if a listed version of A race condition flaw is installed.

Which versions are affected?

Compare what you have installed with redhat/ansible tower <= 3.3.4; redhat/ansible tower >= 3.3.5, <= 3.4.5; redhat/ansible tower >= 3.5.0, <= 3.5.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-362: Race Condition; CWE-377. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ansible security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 11, 2020 · Monitored products — high

    Detected

    A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p "; this operation does not fail if the directory already exists and is owned by another

  2. Jun 17, 2026 · Monitored products — high

    Updated

    A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p "; this operation does not fail if the directory already exists and is owned by another

Sources

  • CVE.orgVulnerability recordCVE-2020-1733

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-1733

    30-day exploitation probability 0.40%

    first.org
  • Monitored products — highVendor advisoryCVE-2020-1733

    A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p "; this operation does not fail if the directory already exists and is owned by another

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — highNov 2, 2026