{"id":"CVE-2023-42115","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-42115","generatedAt":"2026-11-04T21:57:14.263Z","title":"Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability.","description":"Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. \n\nThe specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.\n. Was ZDI-CAN-17434.","published":"2024-05-03T03:15:50.000Z","lastModified":"2026-06-17T06:23:30.000Z","status":"Analyzed","sourceIdentifier":"zdi-disclosures@trendmicro.com","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":["exim/exim"],"epss":{"score":0.12185,"percentile":0.96169,"date":"2026-11-03","history":[{"date":"2026-09-28","score":0.1129,"percentile":0.95836}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 12.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-28T00:00:00.000Z","detail":{"to":0.1129,"from":0.09961,"percentile":0.95836},"summary":"EPSS moved from 10.0% to 11.3% probability of exploitation in the next thirty days."}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-1469/","tags":["Third Party Advisory"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-1469/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-42115","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}