CVE-2021-20193 (GCVE-0-2021-20193)

Vulnerability from cvelistv5 – Published: 2021-03-26 16:41 – Updated: 2026-10-14 10:04
VLAI
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:00 UTC
CWE
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1020 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a tar Affected: 1.33 and earlier
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
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              "url": "https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777"
            },
            {
              "name": "GLSA-202105-29",
              "tags": [
                "vendor-advisory",
                "x_refsource_GENTOO"
              ],
              "url": "https://security.gentoo.org/glsa/202105-29"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2021-20193",
        "datePublished": "2021-03-26T16:41:23.000Z",
        "dateReserved": "2020-12-17T00:00:00.000Z",
        "dateUpdated": "2026-10-14T10:04:09.398Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.