{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/81295?format=json","vulnerability_id":"VCID-ppcr-yrpq-u3g8","summary":"The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.","aliases":[{"alias":"CVE-2011-4597"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/339433?format=json","purl":"pkg:deb/debian/asterisk@1:1.8.8.0~dfsg-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/asterisk@1:1.8.8.0~dfsg-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/339387?format=json","purl":"pkg:deb/debian/asterisk@1:16.28.0~dfsg-0%2Bdeb11u4?distro=sid","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-gh5j-yza2-v3fu"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/asterisk@1:16.28.0~dfsg-0%252Bdeb11u4%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/339389?format=json","purl":"pkg:deb/debian/asterisk@1:22.9.0%2Bdfsg%2B~cs6.16.60671434-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/asterisk@1:22.9.0%252Bdfsg%252B~cs6.16.60671434-1%3Fdistro=sid"}],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2011-4597","reference_id":"","reference_type":"","scores":[{"value":"0.00685","scoring_system":"epss","scoring_elements":"0.72015","published_at":"2026-05-29T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2011-4597"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4597","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4597"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651552","reference_id":"651552","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651552"}],"weaknesses":[],"exploits":[],"severity_range_score":null,"exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-ppcr-yrpq-u3g8"}