{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-42116", "assignerOrgId": "99f1926a-a320-47d8-bbb5-42feb611262e", "state": "PUBLISHED", "assignerShortName": "zdi", "dateReserved": "2023-09-06T21:14:24.436Z", "datePublished": "2024-05-03T02:13:24.558Z", "dateUpdated": "2025-11-04T19:21:50.417Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "99f1926a-a320-47d8-bbb5-42feb611262e", "shortName": "zdi", "dateUpdated": "2024-09-18T18:30:10.809Z"}, "title": "Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability", "descriptions": [{"lang": "en", "value": "Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.\n. Was ZDI-CAN-17515."}], "affected": [{"vendor": "Exim", "product": "Exim", "versions": [{"version": "exim 4.95", "status": "affected"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-121", "description": "CWE-121: Stack-based Buffer Overflow", "type": "CWE"}]}], "references": [{"url": "https://www.zerodayinitiative.com/advisories/ZDI-23-1470/", "name": "ZDI-23-1470", "tags": ["x_research-advisory"]}], "dateAssigned": "2023-09-06T21:25:45.464Z", "datePublic": "2023-09-27T22:21:06.760Z", "source": {"lang": "en", "value": "Anonymous"}, "metrics": [{"format": "CVSS", "cvssV3_0": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}}]}, "adp": [{"affected": [{"vendor": "exim", "product": "exim", "cpes": ["cpe:2.3:a:exim:exim:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "versions": [{"version": "0", "status": "affected", "lessThan": "4.96.1", "versionType": "custom"}, {"version": "0", "status": "affected", "lessThan": "4.97", "versionType": "custom"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-07-05T15:02:42.925012Z", "id": "CVE-2023-42116", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T20:58:17.152Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://www.zerodayinitiative.com/advisories/ZDI-23-1470/", "name": "ZDI-23-1470", "tags": ["x_research-advisory", "x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00002.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T19:21:50.417Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*", "matchCriteriaId": "BC8D7E21-6CC1-45EE-A100-AC7B6E0D9FC8", "versionEndExcluding": "4.96.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.\n. Was ZDI-CAN-17515."}, {"lang": "es", "value": "Vulnerabilidad de ejecuci\u00f3n remota de c\u00f3digo de desbordamiento de b\u00fafer en la regi\u00f3n stack de la memoria del desaf\u00edo SMTP de Exim. Esta vulnerabilidad permite a atacantes remotos ejecutar c\u00f3digo arbitrario en las instalaciones afectadas de Exim. No se requiere autenticaci\u00f3n para aprovechar esta vulnerabilidad. La falla espec\u00edfica existe en el manejo de solicitudes de desaf\u00edo NTLM. El problema se debe a la falta de una validaci\u00f3n adecuada de la longitud de los datos proporcionados por el usuario antes de copiarlos en un b\u00fafer basado en pila de longitud fija. Un atacante puede aprovechar esta vulnerabilidad para ejecutar c\u00f3digo en el contexto de la cuenta de servicio. Era ZDI-CAN-17515."}], "id": "CVE-2023-42116", "lastModified": "2025-11-04T20:16:48.907", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "[email protected]", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2024-05-03T03:15:50.303", "references": [{"source": "[email protected]", "tags": ["Third Party Advisory"], "url": "https://www.zerodayinitiative.com/advisories/ZDI-23-1470/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00002.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.zerodayinitiative.com/advisories/ZDI-23-1470/"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "[email protected]", "type": "Secondary"}]}

{"bugzilla": {"description": "Exim: SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability", "id": "2241528", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2241528"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-119", "details": ["Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.\nThe specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.\n. Was ZDI-CAN-17515.", "The vulnerability was found in Exim within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Authentication is not required to exploit this vulnerability."], "name": "CVE-2023-42116", "public_date": "2023-09-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-42116"], "statement": "The vulnerable package Exim is not shipped in any Red Hat products.", "threat_severity": "Important"}