CVE-2020-12673

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*", "matchCriteriaId": "346B659D-F8B1-43E5-A50E-2FC6ED1F6536", "versionEndExcluding": "2.3.11.3", "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}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*", "matchCriteriaId": "815D70A8-47D3-459C-A32C-9FEACA0659D1", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*", "matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*", "matchCriteriaId": "80F0FA5D-8D3B-4C0E-81E2-87998286AF33", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "matchCriteriaId": "36D96259-24BD-44E2-96D9-78CE1D41F956", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read."}, {"lang": "es", "value": "En Dovecot versiones anteriores a 2.3.11.3, el env\u00edo de una petici\u00f3n NTLM con formato especial bloquear\u00e1 el servicio auth debido a una lectura fuera de l\u00edmites"}], "id": "CVE-2020-12673", "lastModified": "2026-06-17T02:52:06.830", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-08-12T16:15:11.823", "references": [{"source": "cve@mitre.org", "tags": ["Broken Link"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00048.html"}, {"source": "cve@mitre.org", "tags": ["Broken Link"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00059.html"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://dovecot.org/security"}, {"source": "cve@mitre.org", "tags": ["Third Party 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{"acknowledgement": "Red Hat would like to thank the Dovecot project for reporting this issue.", "affected_release": [{"advisory": "RHSA-2020:3617", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "dovecot-1:2.2.36-6.el7_8.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-09-03T00:00:00Z"}, {"advisory": "RHSA-2020:3713", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "dovecot-1:2.3.8-2.el8_2.2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-09-10T00:00:00Z"}, {"advisory": "RHSA-2020:3735", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "dovecot-1:2.2.36-5.el8_0.3", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-09-14T00:00:00Z"}, {"advisory": "RHSA-2020:3736", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "dovecot-1:2.2.36-10.el8_1.2", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-09-14T00:00:00Z"}], "bugzilla": {"description": "dovecot: Out of bound reads in dovecot NTLM implementation", "id": "1866313", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1866313"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.", "A flaw was found in dovecot. An out-of-bounds read flaw was found in the way dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly preventing login. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "Upstream suggests that this flaw can be mitigated by disabling NTLM authentication. NTLM authentication can be disabled by using the configuration parameter \"auth_mechanisms\". More details available at: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/"}, "name": "CVE-2020-12673", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "dovecot", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "dovecot", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2020-08-12T12:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-12673\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-12673\nhttps://dovecot.org/pipermail/dovecot-news/2020-August/000442.html"], "threat_severity": "Important"}

{}