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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:exim:exim:4.88:-:*:*:*:*:*:*", "matchCriteriaId": "144B3769-7408-4C7C-94EB-108CD2B238E4", "vulnerable": true}, {"criteria": "cpe:2.3:a:exim:exim:4.89:-:*:*:*:*:*:*", "matchCriteriaId": "9B52AB04-BA19-42D7-811E-61BBABD0735F", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands."}, {"lang": "es", "value": "La funci\u00f3n receive_msg en receive.c en el demonio SMTP en Exim 4.88 y 4.89 permite que atacantes remotos ejecuten c\u00f3digo arbitrario o provoquen una denegaci\u00f3n de servicio (uso de memoria previamente liberada) mediante vectores relacionados con comandos BDAT."}], "id": "CVE-2017-16943", "lastModified": "2026-05-13T00:24:29.033", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": 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{"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "http://openwall.com/lists/oss-security/2017/11/25/3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2021/05/04/7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039872"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking"], "url": "https://bugs.exim.org/show_bug.cgi?id=2199"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bde"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit"], "url": 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{"bugzilla": {"description": "exim: use-after-free in receive_msg function via vectors involving BDAT commands", "id": "1517680", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1517680"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands."], "mitigation": {"lang": "en:us", "value": "if you are running Exim 4.88 or newer, then in the main section of your Exim configuration, set:\nchunking_advertise_hosts =\nThis disables advertising the ESMTP CHUNKING extension, making the BDAT verb unavailable and avoids letting an attacker apply the logic."}, "name": "CVE-2017-16943", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "exim", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2017-11-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-16943\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-16943"], "threat_severity": "Critical"}

{}