{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2023-51764 in the wild and no public exploit code.","fix":"Change a configuration setting.","what":"CVE-2023-51764 is a medium-severity vulnerability in Fedoraproject Fedora, published on 24 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-51764 and fix it if it is affected.\n\nWhat it is: CVE-2023-51764 is a medium-severity vulnerability in Fedoraproject Fedora, published on 24 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-51764 in the wild and no public exploit code.\n\nAffected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2023-51764/ (Markdown: https://insights.sbomify.com/CVE-2023-51764/index.md)","id":"CVE-2023-51764","markdown":"https://insights.sbomify.com/CVE-2023-51764/index.md","name":"CVE-2023-51764","record":{"aliases":["ALSA-2024:9243","AZL-32296","AZL-35110","CLSA-2025-1738267482","CLSA-2026-1778834899","CLSA-2026-1778834936","DEBIAN-CVE-2023-51764","DLA-3725-1","GHSA-j5jm-hg4x-w8rx","MGASA-2024-0029","RHSA-2024:9243","RLSA-2024:9243","SUSE-SU-2023:4981-1","SUSE-SU-2024:0012-1","SUSE-SU-2024:1149-1","UBUNTU-CVE-2023-51764","USN-6591-1","USN-6591-2","openSUSE-SU-2024:13538-1"],"analysis":{"component_type":"server_software","fix_type":"configuration_change","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Postfix mail server","requires_auth":"none","summary":"Remote attackers can bypass SPF protection and spoof email senders in Postfix if specific SMTP smuggling mitigations are not configured.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"postfix","vendor":"postfix"},{"product":"enterprise_linux","vendor":"redhat"}],"cvss":{"score":5.3,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"description":"Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports \u003cLF\u003e.\u003cCR\u003e\u003cLF\u003e but some other popular e-mail servers do not. To prevent attack variants (by always disallowing \u003cLF\u003e without \u003cCR\u003e), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.","ecosystems":["AlmaLinux:9","Red Hat:enterprise_linux:9::appstream","Rocky Linux:9","SUSE:Enterprise Storage 7.1","SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS","SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","SUSE:Linux Enterprise Module for Basesystem 15 SP4","SUSE:Linux Enterprise Module for Basesystem 15 SP5","SUSE:Linux Enterprise Module for Legacy 15 SP4","SUSE:Linux Enterprise Module for Legacy 15 SP5","SUSE:Linux Enterprise Module for Server Applications 15 SP4","SUSE:Linux Enterprise Module for Server Applications 15 SP5","SUSE:Linux Enterprise Real Time 15 SP4","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server 15 SP3-LTSS","SUSE:Linux Enterprise Server 15 SP4-LTSS","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 15 SP3","SUSE:Linux Enterprise Server for SAP Applications 15 SP4","SUSE:Linux Enterprise Software Development Kit 12 SP5","SUSE:Manager Proxy 4.3","SUSE:Manager Server 4.3","openSUSE:Leap 15.4","openSUSE:Leap 15.5","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":"2023-12-26","github_poc":4,"max_poc_stars":23,"metasploit":0,"nuclei":0,"refs":[{"date":"2023-12-26T17:02:20Z","kind":"github_poc","ref":"https://github.com/duy-31/CVE-2023-51764","stars":23,"title":"Postfix SMTP Smuggling - Expect Script POC"},{"date":"2023-12-28T06:20:13Z","kind":"github_poc","ref":"https://github.com/eeenvik1/CVE-2023-51764","stars":4,"title":"PoC CVE-2023-51764 "},{"date":"2023-12-31T14:33:26Z","kind":"github_poc","ref":"https://github.com/d4op/CVE-2023-51764-POC","stars":1,"title":"just idea, no cp pls"},{"date":"2024-01-05T07:07:47Z","kind":"github_poc","ref":"https://github.com/Double-q1015/CVE-2023-51764","stars":0,"title":"CVE-2023-51764 poc"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Security feature bypass in n/a","id":"CVE-2023-51764","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"fedoraproject:fedora","products":["fedoraproject:fedora","redhat:enterprise_linux"],"type":"security_feature_bypass","year":"2023"},"n_packages":63,"n_references":17,"next":{"headline":"Security feature bypass in n/a","id":"CVE-2023-51765"},"packages":[{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/almalinux/postfix","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/almalinux/postfix-cdb","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/almalinux/postfix-ldap","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb","purl":"pkg:rpm/almalinux/postfix-lmdb","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/almalinux/postfix-mysql","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/almalinux/postfix-pcre","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/almalinux/postfix-perl-scripts","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql","purl":"pkg:rpm/almalinux/postfix-pgsql","source":"ALSA-2024:9243"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite","purl":"pkg:rpm/almalinux/postfix-sqlite","source":"ALSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/redhat/postfix","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/redhat/postfix-cdb","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb-debuginfo","purl":"pkg:rpm/redhat/postfix-cdb-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-debuginfo","purl":"pkg:rpm/redhat/postfix-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-debugsource","purl":"pkg:rpm/redhat/postfix-debugsource","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/redhat/postfix-ldap","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap-debuginfo","purl":"pkg:rpm/redhat/postfix-ldap-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb","purl":"pkg:rpm/redhat/postfix-lmdb","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb-debuginfo","purl":"pkg:rpm/redhat/postfix-lmdb-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/redhat/postfix-mysql","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql-debuginfo","purl":"pkg:rpm/redhat/postfix-mysql-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/redhat/postfix-pcre","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre-debuginfo","purl":"pkg:rpm/redhat/postfix-pcre-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/redhat/postfix-perl-scripts","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql","purl":"pkg:rpm/redhat/postfix-pgsql","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql-debuginfo","purl":"pkg:rpm/redhat/postfix-pgsql-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite","purl":"pkg:rpm/redhat/postfix-sqlite","source":"RHSA-2024:9243"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite-debuginfo","purl":"pkg:rpm/redhat/postfix-sqlite-debuginfo","source":"RHSA-2024:9243"},{"ecosystem":"Rocky Linux:9","fixed":["2:3.5.25-1.el9"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/rocky-linux/postfix?distro=rocky-linux-9\u0026epoch=2","source":"RLSA-2024:9243"},{"ecosystem":"SUSE:Enterprise Storage 7.1","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Enterprise%20Storage%207.1","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Enterprise Storage 7.1","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix-bdb","purl":"pkg:rpm/suse/postfix-bdb\u0026distro=SUSE%20Enterprise%20Storage%207.1","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-ESPOS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix-bdb","purl":"pkg:rpm/suse/postfix-bdb\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-ESPOS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix-bdb","purl":"pkg:rpm/suse/postfix-bdb\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix-bdb","purl":"pkg:rpm/suse/postfix-bdb\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix-bdb","purl":"pkg:rpm/suse/postfix-bdb\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP4","fixed":["3.5.9-150300.5.15.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4","source":"SUSE-SU-2024:0012-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP5","fixed":["3.7.3-150500.3.11.1"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/suse/postfix\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5","source":"SUSE-SU-2023:4981-1"}],"prev":{"headline":"ActiveAdmin CSV Injection leading to sensitive information disclosure","id":"CVE-2023-51763"},"products":["n/a"],"published":"2023-12-24","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["n/a"]},"summary":"Remote attackers can bypass SPF protection and spoof email senders in Postfix if specific SMTP smuggling mitigations are not configured.","url":"https://insights.sbomify.com/CVE-2023-51764/"}