{"cve":"CVE-2007-2243","nvd":{"published":"2007-04-25T16:19:00.000","modified":"2026-06-16T22:39:12.640","status":"Modified","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html","http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html","http://securityreason.com/securityalert/2631","http://www.osvdb.org/34600","http://www.securityfocus.com/bid/23601"],"products":["openbsd:openssh"],"source":"nvd","synced_at":"2026-10-19T19:46:28.846926071+00:00"},"epss":{"cve":"CVE-2007-2243","score":0.02405,"percentile":0.84069,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}