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Vulnerability record · CVE-2020-12673 · published 12 August 2020

CVE-2020-12673: Dovecot out-of-bounds read vulnerability

Dovecot · Dovecot

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.

7.5 CVSS 3.1 High EPSS 6.2% · top 6.7% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 5.0
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00048.html Broken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00059.html Broken Link
https://dovecot.org/security Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00024.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPF
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYZU6CHA3VMYYAUCMHSCCQK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XKKAL3OMG76ZZ7CIEMQP2K6
https://security.gentoo.org/glsa/202009-02 Third Party Advisory
https://usn.ubuntu.com/4456-1/ Third Party Advisory
https://usn.ubuntu.com/4456-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4745 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/08/12/2 ExploitMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00048.html Broken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00059.html Broken Link
https://dovecot.org/security Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00024.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPF
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYZU6CHA3VMYYAUCMHSCCQK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XKKAL3OMG76ZZ7CIEMQP2K6
https://security.gentoo.org/glsa/202009-02 Third Party Advisory
https://usn.ubuntu.com/4456-1/ Third Party Advisory
https://usn.ubuntu.com/4456-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4745 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/08/12/2 ExploitMailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-12673), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.