{"cve":"CVE-2009-3287","nvd":{"published":"2009-09-22T10:30:00.640","modified":"2026-06-16T23:11:18.570","status":"Modified","description":"lib/thin/connection.rb in Thin web server before 1.2.4 relies on the X-Forwarded-For header to determine the IP address of the client, which allows remote attackers to spoof the IP address and hide activities via a modified X-Forwarded-For header.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://github.com/macournoyer/thin/blob/master/CHANGELOG","http://github.com/macournoyer/thin/commit/7bd027914c5ffd36bb408ef47dc749de3b6e063a","http://www.openwall.com/lists/oss-security/2009/09/12/1","http://github.com/macournoyer/thin/blob/master/CHANGELOG","http://github.com/macournoyer/thin/commit/7bd027914c5ffd36bb408ef47dc749de3b6e063a"],"products":["macournoyer:thin"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-3287","score":0.01382,"percentile":0.72156,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j24p-r6wx-r79w","url":"https://osv.dev/vulnerability/GHSA-j24p-r6wx-r79w","summary":"High severity vulnerability that affects thin","modified":"2024-11-28T05:30:56.054926Z","packages":[{"ecosystem":"RubyGems","name":"thin","purl":"pkg:gem/thin","ranges":["<1.2.4"],"fixed":["1.2.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}