CVE-2021-20193

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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."}, {"lang": "es", "value": "Se detect\u00f3 un fallo en el archivo src/list.c de tar versiones 1.33 y anteriores. Este fallo permite a un atacante que puede enviar un archivo de entrada dise\u00f1ado a tar causar un consumo no controlado de memoria. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema."}], "id": "CVE-2021-20193", "lastModified": "2026-10-14T11:16:51.110", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-20193", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-08T21:00:52.960226Z", "version": "2.0.3"}}]}, "published": "2021-03-26T17:15:12.843", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1917565"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://savannah.gnu.org/bugs/?59897"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202105-29"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1917565"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://savannah.gnu.org/bugs/?59897"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202105-29"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "tar: Memory leak in read_header() in list.c", "id": "1917565", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1917565"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-401->CWE-125", "details": ["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.", "A flaw was found in the src/list.c of tar. 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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-20193", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "impact": "low", "package_name": "tar", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "impact": "low", "package_name": "tar", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "impact": "low", "package_name": "tar", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "tar", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-01-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-20193\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20193"], "statement": "The vulnerability in GNU Tar is rated as moderate severity because, while it results in a denial of service through memory leaks, its exploitation is constrained to the application's operational context without impacting the broader system integrity or security. The leak occurs in the `read_header()` function, where memory allocated for handling tar entries is not properly released, leading to resource exhaustion. However, this vulnerability does not facilitate arbitrary code execution, privilege escalation, or data corruption, which are characteristic of higher-severity vulnerabilities. Furthermore, the memory leak is contingent upon user interaction, as it requires the extraction of maliciously crafted tar files, thereby limiting its potential for widespread exploitation.\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-401: Missing Release of Memory after Effective Lifetime, leading to a CWE-125: Out-of-bounds Read vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\nBaseline configurations, change control, and configuration settings enforce secure system states, patch management, and proper runtime settings, helping prevent memory handling issues from insecure defaults, unpatched components, or misconfigurations. Process isolation and memory protection mechanisms preserve memory integrity by isolating processes and limiting an attacker\u2019s ability to exploit or access memory. System monitoring adds an additional layer of defense by detecting anomalous behavior and unauthorized memory access.", "threat_severity": "Moderate"}

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