# CVE-2023-51764: postfix-lmdb: The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and... CVE-2023-51764 is fixed in 18 products on 1 platform, first by postfix 3.3.0-1ubuntu0.4+esm3, released December 23, 2023. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2023-51764 - Priority: Routine - CVSS: 5.3 (Moderate) - EPSS: 0.0264 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 23, 2023 ## Description The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS. Security Fix(es): * postfix: SMTP smuggling vulnerability (CVE-2023-51764) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.5 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | postfix Debian 12.15 (bookworm) | 3.7.9-0+deb12u1 | [DEBIAN-CVE-2023-51764](https://patchblox.com/security/data/fix/linux/debian-cve-2023-51764.md) | Dec 24, 2023 | | Linux | postfix Debian 13.5 (trixie) | 3.8.4-1 | [DEBIAN-CVE-2023-51764](https://patchblox.com/security/data/fix/linux/debian-cve-2023-51764.md) | Dec 24, 2023 | | Linux | postfix Debian 14 | 3.8.4-1 | [DEBIAN-CVE-2023-51764](https://patchblox.com/security/data/fix/linux/debian-cve-2023-51764.md) | Dec 24, 2023 | | Linux | postfix RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix rocky 9 | 2:3.5.25-1.el9 | [RLSA-2024:9243](https://patchblox.com/security/data/fix/linux/rlsa-2024-9243.md) | Mar 17, 2025 | | Linux | postfix-cdb RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-cdb Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-cdb 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-cdb-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-cdb Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-cdb 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-cdb-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-cdb Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-cdb 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-cdb-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-cdb almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-cdb amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-cdb ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-cdb-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-debugsource amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-ldap RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-ldap Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-ldap 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-ldap-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-ldap Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-ldap 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-ldap-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-ldap Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-ldap 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-ldap-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-ldap almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-ldap amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-ldap ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-ldap-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-lmdb RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-lmdb Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-lmdb 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-lmdb-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-lmdb Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-lmdb 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-lmdb-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-lmdb Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-lmdb 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-lmdb-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-lmdb almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-lmdb amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-lmdb ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-lmdb-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-mysql RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-mysql Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-mysql 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-mysql-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-mysql Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-mysql 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-mysql-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-mysql Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-mysql 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-mysql-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-mysql almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-mysql amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-mysql ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-mysql-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-pcre RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-pcre Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-pcre 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-pcre-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-pcre Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-pcre 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-pcre-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-pcre Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-pcre 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-pcre-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-pcre almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-pcre amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-pcre ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-pcre-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-perl-scripts RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-perl-scripts almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-perl-scripts amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-perl-scripts ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-pgsql RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-pgsql Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-pgsql 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-pgsql-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-pgsql Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-pgsql 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-pgsql-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-pgsql Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-pgsql 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-pgsql-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-pgsql almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-pgsql amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-pgsql ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-pgsql-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-sqlite RHEL 9 | 2:3.5.25-1.el9 | [RHSA-2024:9243](https://patchblox.com/security/data/fix/linux/rhsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-sqlite Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm3 | [postfix-sqlite 3.3.0-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-postfix-sqlite-3.3.0-1ubuntu0.4-esm3.md) | Dec 23, 2023 | | Linux | postfix-sqlite Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4 | [postfix-sqlite 3.4.13-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-postfix-sqlite-3.4.13-0ubuntu1.4.md) | Dec 23, 2023 | | Linux | postfix-sqlite Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.3 | [postfix-sqlite 3.6.4-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-postfix-sqlite-3.6.4-1ubuntu1.3.md) | Dec 23, 2023 | | Linux | postfix-sqlite almalinux 9 | 2:3.5.25-1.el9 | [ALSA-2024:9243](https://patchblox.com/security/data/fix/linux/alsa-2024-9243.md) | Nov 12, 2024 | | Linux | postfix-sqlite amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | | Linux | postfix-sqlite ol 9 | 2:3.5.25-1.el9 | [ELSA-2024-9243](https://patchblox.com/security/data/fix/linux/elsa-2024-9243.md) | Nov 14, 2024 | | Linux | postfix-sqlite-debuginfo amzn 2023 | 2:3.7.2-4.amzn2023.0.5 | [ALAS2023-2024-495](https://patchblox.com/security/data/fix/linux/alas2023-2024-495.md) | Jan 19, 2024 | --- Data as of 2026-11-09T01:18:40Z UTC. 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