{"id":"CVE-2021-21958","state":"PUBLISHED","title":"A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory c","description":"A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory corruption and potential arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.","publishedAt":"2022-02-16T16:38:31.000Z","updatedAt":"2025-04-15T19:10:05.119Z","severity":{"score":7.8,"label":"High","version":"3.0","vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"talos"},"assigner":"talos","products":["n/a Hancom"],"affected":[{"vendor":"n/a","product":"Hancom","versions":[{"version":"Hancom Office 2020 11.0.0.2353","status":"affected"}]}],"references":["https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T19:47:59.168Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/21xxx/CVE-2021-21958.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-21958","state":"PUBLISHED","datePublished":"2022-02-16T16:38:31.000Z","dateUpdated":"2025-04-15T19:10:05.119Z","assignerShortName":"talos","assignerOrgId":"b86d76f8-0f8a-4a96-a78d-d8abfc7fc29b","dateReserved":"2021-01-04T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory corruption and potential arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability."}],"affected":[{"vendor":"n/a","product":"Hancom","versions":[{"version":"Hancom Office 2020 11.0.0.2353","status":"affected"}]}],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_0":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"talos","dateUpdated":"2022-02-16T16:38:31.000Z","orgId":"b86d76f8-0f8a-4a96-a78d-d8abfc7fc29b"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"talos-cna@cisco.com","ID":"CVE-2021-21958","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Hancom","version":{"version_data":[{"version_value":"Hancom Office 2020 11.0.0.2353"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory corruption and potential arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability."}]},"impact":{"cvss":{"baseScore":7.8,"baseSeverity":"High","vectorString":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.0"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-122: Heap-based Buffer Overflow"}]}]},"references":{"reference_data":[{"name":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386","refsource":"MISC","url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T18:30:23.696Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-04-15T18:23:47.585078Z","id":"CVE-2021-21958","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-04-15T19:10:05.119Z"}}]}}}