.1.20 allows users to bypass access control lists (ACLs) by encoding the URL with hexadecimal escape sequences. NIST National Vulnerability Database (NVD) -- services.nvd.nist.gov (CVE / CVSS / CPE). {"cve":{"id":"CVE-1999-1273","sourceIdentifier":"cve@mitre.org","published":"1998-02-20T05:00:00.000","lastModified":"2026-06-16T21:50:05.197","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Squid Internet Object Cache 1.1.20 allows users to bypass access control lists (ACLs) by encoding the URL with hexadecimal escape sequences."}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10.0,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":true,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-Other"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:national_science_foundation:squid_web_proxy:1.1.20:*:*:*:*:*:*:*","matchCriteriaId":"C92A4975-559A-4789-AFE9-495A9AE595D3"}]}]}],"references":[{"url":"http://www.securityfocus.com/archive/1/8551","source":"cve@mitre.org","tags":["Exploit","Patch","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/1627","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/8551","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit","Patch","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/1627","source":"af854a3a-2127-422b-91ae-364da2661108"}]}},