CVE-2021-20193

Name: CVE-2021-20193
Creator: NVD / NIST
Published: 2021-03-26T17:15:12.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2021-20193 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. 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. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

3.3/10

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

EPSS Probability

1.09%

61.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gnu	Tar	<= 1.33

References

https://bugzilla.redhat.com/show_bug.cgi?id=1917565Issue Tracking, Patch, Third Party Advisory
https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777Mailing List, Patch, Third Party Advisory
https://savannah.gnu.org/bugs/?59897Issue Tracking, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202105-29Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1917565Issue Tracking, Patch, Third Party Advisory
https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777Mailing List, Patch, Third Party Advisory
https://savannah.gnu.org/bugs/?59897Issue Tracking, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202105-29Third Party Advisory

Timeline

Published: Mar 26, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-20193?

How severe is CVE-2021-20193?

CVE-2021-20193 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20193?

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-2021-20193?

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

Scan your code now

Source: NVD / NIST