CVE-2021-20193

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Summary

CVECVE-2021-20193
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-26 17:15:12 UTC
Updated2026-10-14 11:16:51 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 3.3 LOW from [email protected]

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

EPSS: 0.010920000 probability, percentile 0.644560000 (date 2026-10-10)

Problem Types: CWE-401 | CWE-125 | CWE-401 CWE-401->CWE-125

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary3.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:M/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gnu Tar All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Tar affected 1.33 and earlier Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
GNU tar - Bugs: bug #59897, Memory Leak GNU Tar 1.33 [Savannah] af854a3a-2127-422b-91ae-364da2661108 savannah.gnu.org Issue Tracking, Patch, Vendor Advisory
1917565 – (CVE-2021-20193) CVE-2021-20193 tar: Memory leak in read_header() in list.c af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
tar.git - GNU Tar af854a3a-2127-422b-91ae-364da2661108 git.savannah.gnu.org Mailing List, Patch, Third Party Advisory
Tar: Denial of service (GLSA 202105-29) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 174868 SUSE Enterprise Linux Security Update for tar (SUSE-SU-2021:0974-1)
  • 174869 SUSE Enterprise Linux Security update for tar (SUSE-SU-2021:0975-1)
  • 179918 Debian Security Update for tar (CVE-2021-20193)
  • 198703 Ubuntu Security Notification for tar Vulnerability (USN-5329-1)
  • 296059 Oracle Solaris 11.4 Support Repository Update (SRU) 36.0.1.101.2 Missing (CPUJUL2021)
  • 500683 Alpine Linux Security Update for tar
  • 501503 Alpine Linux Security Update for tar
  • 504452 Alpine Linux Security Update for tar
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670221 EulerOS Security Update for tar (EulerOS-SA-2021-1854)
  • 670474 EulerOS Security Update for tar (EulerOS-SA-2021-2232)
  • 670676 EulerOS Security Update for tar (EulerOS-SA-2021-2434)
  • 670730 EulerOS Security Update for tar (EulerOS-SA-2021-2488)
  • 670785 EulerOS Security Update for tar (EulerOS-SA-2021-2543)
  • 670809 EulerOS Security Update for tar (EulerOS-SA-2021-2567)
  • 670850 EulerOS Security Update for tar (EulerOS-SA-2021-1854)
  • 710085 Gentoo Linux Tar Denial of service (GLSA 202105-29)
  • 750286 OpenSUSE Security Update for tar (openSUSE-SU-2021:0494-1)
  • 752108 SUSE Enterprise Linux Security Update for tar (SUSE-SU-2022:1548-1)

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