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CVE-2021-20193

16
FAUCET Score

CVE-2021-20193 describes a memory consumption flaw in GNU tar versions 1.33 and earlier, specifically within the src/list.c component. An attacker can exploit this vulnerability by providing a specially crafted input file, leading to uncontrolled memory usage and impacting system availability. Rated with a CVSS score of 3.3 (LOW), this vulnerability requires local access and user interaction (UI:R) for exploitation, with the primary impact being a denial of service. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.33CPE matchmatch criteria
cpe:2.3:a:gnu:tar:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.3LOW

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.09%
Probability of exploitation in next 30 days
EPSS Percentile
62.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0109 is in the 70th percentile among its peer group of 577 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia nvd_reference
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: tar

Vendor Advisories (1)

redhatCVE-2021-20193Moderate

tar: Memory leak in read_header() in list.c

Jan 17, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
git.savannah.gnu.org / cgit/tar.git/commit
Mailing ListPatchThird Party Advisory
savannah.gnu.org / bugs
Issue TrackingPatchVendor Advisory
security.gentoo.org / glsa/202105-29
Third Party Advisory