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Vulnerabilities

Vulnerability · CVE-2021-20193

A flaw was found in the src/list.c of tar 1.33 and earlier.

Published Mar 26, 2021 · catalog updated Oct 14, 2026 · A flaw was found

Check if you run it

No confirmed exploitation is on record for CVE-2021-20193. EPSS is 1.09%. Act only if a listed version of A flaw was found 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 flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.09%
Remediation
Version ranges on file
Affected products
cpe gnu/tar · stated tar

A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.

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 gnu/tarversion unspecified
  • stated tar<= 1.33

How to fix CVE-2021-20193

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-2021-20193. EPSS is 1.09%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with <= 1.33. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read; CWE-401: Missing Release of Memory after Effective Lifetime. EPSS 1.09%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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 26, 2021 · NIST NVD

    Detected

    A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.

  2. Oct 14, 2026 · NIST NVD

    Updated

    A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.

Sources

  • CVE.orgVulnerability recordCVE-2021-20193

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-20193

    30-day exploitation probability 1.1%

    first.org
  • NIST NVDVulnerability recordCVE-2021-20193

    A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.