{"answers":{"affected":"It affects 4 products.","exploited":"There is no known exploitation of CVE-2023-51766 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2023-51766 is a medium-severity vulnerability in Debian Debian Linux, 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-2023-51766 and fix it if it is affected.\n\nWhat it is: CVE-2023-51766 is a medium-severity vulnerability in Debian Debian Linux, 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-2023-51766 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2023-51766/ (Markdown: https://insights.sbomify.com/CVE-2023-51766/index.md)","id":"CVE-2023-51766","markdown":"https://insights.sbomify.com/CVE-2023-51766/index.md","name":"CVE-2023-51766","record":{"aliases":["CLEANSTART-2025-LV68873","CLSA-2024-1709562273","CLSA-2024-1709563071","DEBIAN-CVE-2023-51766","DLA-3708-1","DSA-5597-1","GHSA-w6ww-869j-cgm6","OESA-2024-1928","UBUNTU-CVE-2023-51766","USN-6611-1","openSUSE-SU-2024:13543-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Exim mail server","requires_auth":"none","summary":"Remote attackers can bypass SPF protection and spoof sender addresses in Exim mail servers using SMTP smuggling techniques.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"exim","vendor":"exim"},{"product":"extra_packages_for_enterprise_linux","vendor":"fedoraproject"},{"product":"fedora","vendor":"fedoraproject"}],"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":"Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. 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 Exim supports \u003cLF\u003e.\u003cCR\u003e\u003cLF\u003e but some other popular e-mail servers do not.","ecosystems":["openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Security feature bypass in n/a","id":"CVE-2023-51766","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","exim:exim","fedoraproject:extra_packages_for_enterprise_linux","fedoraproject:fedora"],"type":"security_feature_bypass","year":"2023"},"n_packages":1,"n_references":20,"next":{"headline":"Auth bypass in n/a","id":"CVE-2023-51767"},"packages":[{"ecosystem":"openSUSE:Tumbleweed","fixed":["4.97.1-1.1"],"introduced":["0"],"last_affected":[],"package":"exim","purl":"pkg:rpm/opensuse/exim\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:13543-1"}],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2023-51765"},"products":["n/a"],"published":"2023-12-24","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2025-11-04","vendors":["n/a"]},"summary":"Remote attackers can bypass SPF protection and spoof sender addresses in Exim mail servers using SMTP smuggling techniques.","url":"https://insights.sbomify.com/CVE-2023-51766/"}