High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-12673
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:35 UTC · Revision 1
Source evidence
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.
osv:CVE-2020-12673
Complete source record
{
"id": "39fdd743a69068befb0ba3dac21cdc614be452ca2e102701c2ce2776db5e3777",
"url": "https://osv.dev/vulnerability/CVE-2020-12673",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-12673",
"summary": "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.",
"evidence": "osv:CVE-2020-12673",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-12673",
"aliases": [
"CVE-2020-12673"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/dovecot/core",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "502c39af9375c2739ce01f93afd0d01c836613fd"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.3.11.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"2.2.20",
"2.2.20.rc1",
"2.2.19",
"2.2.19.rc2",
"2.2.19.rc1",
"2.2.18",
"2.2.17",
"2.2.17.rc2",
"2.2.17.rc1",
"2.2.16",
"2.2.16.rc1",
"2.2.15",
"2.2.14",
"2.2.14.rc1",
"2.2.13",
"2.2.13.rc1",
"2.2.12",
"2.2.11",
"2.2.10",
"2.2.9",
"2.2.8",
"2.2.7",
"2.2.6",
"2.2.5",
"2.2.4",
"2.2.3",
"2.2.2",
"2.2.1",
"2.2.0",
"2.2.rc7",
"2.2.rc6",
"2.2.rc5",
"2.2.rc4",
"2.2.rc3",
"2.2.rc2",
"2.2.rc1",
"2.2.beta2",
"2.2.beta1",
"2.2.alpha1",
"2.1.rc6",
"2.1.rc5",
"2.1.rc4",
"2.1.rc3",
"2.1.rc2",
"2.1.rc1",
"2.1.beta1",
"2.1.alpha2",
"2.1.alpha1",
"2.0.8",
"2.0.7",
"2.0.6",
"2.0.5",
"2.0.4",
"2.0.3",
"2.0.2",
"2.0.1",
"2.0.0",
"2.0.rc6",
"2.0.rc5",
"2.0.rc4",
"2.0.rc3",
"2.0.rc2",
"2.0.rc1",
"2.0.beta6",
"2.0.beta5",
"2.0.beta4",
"2.0.beta3",
"2.0.beta2",
"2.0.beta1",
"2.0.alpha3",
"2.0.alpha2",
"2.0.alpha1",
"1.2.rc1",
"1.2.beta4",
"1.2.beta3",
"1.2.beta2",
"1.2.beta1",
"1.2.alpha5",
"1.2.alpha4",
"1.2.alpha3",
"1.2.alpha2",
"1.2.alpha1",
"1.1.rc3",
"1.1.rc2",
"1.1.rc1",
"1.1.beta16",
"1.1.beta14",
"1.1.beta13",
"1.1.beta12",
"1.1.beta11",
"1.1.beta10",
"1.1.beta9",
"1.1.beta8",
"1.1.beta6",
"1.1.beta5",
"1.1.beta4",
"1.1.beta3",
"1.1.beta2",
"1.1.beta1",
"1.1.alpha6",
"1.1.alpha5",
"1.1.alpha4",
"1.1.alpha2",
"1.1.alpha1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-12673.json"
}
}
],
"modified": "2026-10-24T10:30:55.418114753Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPFSYP4FM4TT/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYZU6CHA3VMYYAUCMHSCCQKJEVEIKPQ2/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XKKAL3OMG76ZZ7CIEMQP2K6KCTD2RAKE/",
"https://dovecot.org/security",
"https://lists.debian.org/debian-lts-announce/2020/08/msg00024.html",
"https://security.gentoo.org/glsa/202009-02",
"https://usn.ubuntu.com/4456-1/",
"https://usn.ubuntu.com/4456-2/",
"https://www.debian.org/security/2020/dsa-4745",
"https://www.openwall.com/lists/oss-security/2020/08/12/2"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
},
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-12673",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438411,
"published_at": "2020-08-12T16:15:11.823+00:00"
}