{"id":"CVE-2018-1172","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-1172","generatedAt":"2026-10-28T23:56:51.966Z","title":"This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318.","description":"This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability. The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system. Was ZDI-CAN-6088.","published":"2018-05-16T21:29:00.000Z","lastModified":"2026-06-17T01:50:38.000Z","status":"Modified","sourceIdentifier":"zdi-disclosures@trendmicro.com","cvss":{"version":"3.0","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["squid-cache/squid"],"epss":{"score":0.08157,"percentile":0.94824,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.10997,"percentile":0.95762},{"date":"2026-09-22","score":0.0831,"percentile":0.94681}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (8.16%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-21T00:00:00.000Z","detail":{"to":0.10997,"from":0.08611,"percentile":0.95762},"summary":"EPSS moved from 8.6% to 11.0% probability of exploitation in the next thirty days."}],"references":[{"url":"http://www.squid-cache.org/Advisories/SQUID-2018_3.txt","tags":["Vendor Advisory"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://zerodayinitiative.com/advisories/ZDI-18-309","tags":["Third Party Advisory","VDB Entry"],"source":"zdi-disclosures@trendmicro.com"},{"url":"http://www.squid-cache.org/Advisories/SQUID-2018_3.txt","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://zerodayinitiative.com/advisories/ZDI-18-309","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-1172","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."}