CVE-2004-2621

Severity: medium (CVSS 4.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2004-12-31 · updated 2026-06-16

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.

Affected products

Nortel Contivity: 2.1.7, 3.00, 3.01, 4.91, 5.01

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
https://exchange.xforce.ibmcloud.com/vulnerabilities/17812
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
https://exchange.xforce.ibmcloud.com/vulnerabilities/17812

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