CVE-2004-2621: n/a vulnerability

CVE-2004-2621: Nortel Contivity VPN Client 2.1.7, 3.00, 3.01, 4.91, and 5.01, when opening a VPN tunnel, does not check th...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 01:36 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2004-2621 affects old Nortel Contivity VPN Client versions. When a VPN tunnel opens, the client delays checking the gateway certificate until after a user dialog appears. That timing flaw can let an attacker positioned between user and gateway impersonate the VPN gateway. Exposure is most likely where legacy Nortel Contivity VPN clients remain installed or used for remote access. Modern environments without these specific clients are unlikely to be affected based on the supplied bundle. Treat this as a legacy remote-access risk. Prioritize discovery and retirement if Contivity clients are still present, especially for staff using public or unmanaged networks. Mitigation focus: Inventory endpoints for the named Nortel Contivity VPN Client versions.; Check Nortel or successor vendor guidance for fixed versions or workarounds.; Replace unsupported VPN clients with currently supported remote-access software..

Prepared: Jun 29, 2026, 16:18 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 4, 2005, 22:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

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Source materials

CVE List V5 sourceCVE List V5
nortel-contivity-gain-access(17812)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

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CWE details

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