{"answers":{"affected":"It affects 3 products.","exploited":"Yes. Attackers have exploited CVE-2018-6789 in the wild since at least 3 Nov 2021, including in ransomware campaigns.","fix":"Upgrade to a fixed version. US federal agencies must fix it by 3 May 2022.","what":"CVE-2018-6789 is a critical memory corruption vulnerability in Canonical Ubuntu Linux, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-6789 and fix it if it is affected.\n\nWhat it is: CVE-2018-6789 is a critical memory corruption vulnerability in Canonical Ubuntu Linux, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2018-6789 in the wild since at least 3 Nov 2021, including in ransomware campaigns.\n\nAffected product: Canonical Ubuntu 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-2018-6789/ (Markdown: https://insights.sbomify.com/CVE-2018-6789/index.md)","id":"CVE-2018-6789","markdown":"https://insights.sbomify.com/CVE-2018-6789/index.md","name":"CVE-2018-6789","record":{"aliases":["CLEANSTART-2025-AY16629","DEBIAN-CVE-2018-6789","DLA-1274-1","DSA-4110-1","GHSA-868p-wr6f-7jfr","UBUNTU-CVE-2018-6789","USN-3565-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Exim mail server","requires_auth":"none","summary":"Remote attackers can execute arbitrary code by sending a crafted message to the Exim SMTP listener, triggering a buffer overflow in the base64d function.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"debian_linux","vendor":"debian"},{"product":"exim","vendor":"exim"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.","ecosystems":[],"exploits":{"exploitdb":2,"first_seen":"2018-03-16","github_poc":5,"max_poc_stars":11,"metasploit":0,"nuclei":0,"refs":[{"date":"2020-03-02T16:53:02Z","kind":"github_poc","ref":"https://github.com/martinclauss/exim-rce-cve-2018-6789","stars":11,"title":"This repository provides a learning environment to understand how an Exim RCE exploit for CVE-2018-6789 works."},{"date":"2019-10-10T09:36:03Z","kind":"github_poc","ref":"https://github.com/synacktiv/Exim-CVE-2018-6789","stars":10,"title":"PoC materials to exploit CVE-2018-6789"},{"date":"2018-11-08T08:25:42Z","kind":"github_poc","ref":"https://github.com/beraphin/CVE-2018-6789","stars":3,"title":null},{"date":"2023-08-05T11:28:49Z","kind":"github_poc","ref":"https://github.com/thistehneisen/CVE-2018-6789-Python3","stars":2,"title":"Exim \u003c 4.90.1 RCE Vulnerability remake for Python3 with arguments passed from CLI"},{"date":"2018-03-16T16:21:22Z","kind":"github_poc","ref":"https://github.com/c0llision/exim-vuln-poc","stars":0,"title":"CVE-2018-6789"},{"date":"2018-05-02","kind":"exploitdb","ref":"44571","stars":null,"title":"Exim \u003c 4.90.1 - 'base64d' Remote Code Execution"},{"date":"2018-10-24","kind":"exploitdb","ref":"45671","stars":null,"title":"exim 4.90 - Remote Code Execution"}],"tier":"exploited"},"has_fix":true,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","indexable":true,"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Known","product":"Exim","requiredAction":"Apply updates per vendor instructions.","vendorProject":"Exim","vulnerabilityName":"Exim Buffer Overflow Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","debian:debian_linux","exim:exim"],"type":"memory_corruption","year":"2018"},"n_packages":0,"n_references":13,"next":{"headline":"Information disclosure in n/a","id":"CVE-2018-6790"},"packages":[],"prev":{"headline":"Denial of service in n/a","id":"CVE-2018-6788"},"products":["n/a"],"published":"2018-02-08","related":[{"cvss_score":9.8,"headline":"SaltStack Salt Authentication Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"GPL-2.0-or-later","name":"Exploit-DB"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-10-21","vendors":["n/a"]},"summary":"Remote attackers can execute arbitrary code by sending a crafted message to the Exim SMTP listener, triggering a buffer overflow in the base64d function.","url":"https://insights.sbomify.com/CVE-2018-6789/"}