{"cve":"CVE-2004-2621","nvd":{"published":"2004-12-31T05:00:00.000","modified":"2026-06-16T22:09:59.903","status":"Modified","description":"Nortel Contivity VPN Client 2.1.7, 3.00, 3.01, 4.91, and 5.01, when opening a VPN tunnel, does not check the gateway certificate until after a dialog box has been displayed to the user, which creates a race condition that allows remote attackers to perform a man-in-the-middle (MITM) attack.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://secunia.com/advisories/12881","http://securitytracker.com/id?1011846","http://www.osvdb.org/11002","http://www.securityfocus.com/bid/11495","http://www130.nortelnetworks.com/cgi-bin/eserv/cs/main.jsp?level=6&category=8&subcategory=6&subtype=&DocumentOID=276620&RenditionID=REND159588"],"products":["nortel:contivity"],"source":"nvd","synced_at":"2026-10-19T19:38:22.000386253+00:00"},"epss":{"cve":"CVE-2004-2621","score":0.00746,"percentile":0.54859,"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."]}