CVE-2005-1802

Nortel VPN Router (aka Contivity) allows remote attackers to cause a denial of service (crash) via an IPsec IKE packet with a malformed ISAKMP header.

Published: 2005-05-27 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2005-1802 is rated Moderate Risk (46.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.59%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2005-1802

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.84% 1.59% +0.75%
2 2024-12-17 1.04% 0.84% -0.20%
3 2024-05-08 — 1.04% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2005-1802

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2005-1802

Affected software / configurations for CVE-2005-1802

Vendor Product Version Raw CPE
nortel contivity 1000_vpn_switch cpe:2.3:h:nortel:contivity:1000_vpn_switch:*:*:*:*:*:*:*
nortel contivity 1500_vpn_switch cpe:2.3:h:nortel:contivity:1500_vpn_switch:*:*:*:*:*:*:*
nortel contivity 1600_secure_ip_services_gateway cpe:2.3:h:nortel:contivity:1600_secure_ip_services_gateway:*:*:*:*:*:*:*
nortel contivity 2000_vpn_switch cpe:2.3:h:nortel:contivity:2000_vpn_switch:*:*:*:*:*:*:*
nortel contivity 2500_vpn_switch cpe:2.3:h:nortel:contivity:2500_vpn_switch:*:*:*:*:*:*:*
nortel contivity 2600_secure_ip_services_gateway cpe:2.3:h:nortel:contivity:2600_secure_ip_services_gateway:*:*:*:*:*:*:*
nortel contivity 4000_vpn_switch cpe:2.3:h:nortel:contivity:4000_vpn_switch:*:*:*:*:*:*:*
nortel contivity 4500_secure_ip_services_gateway cpe:2.3:h:nortel:contivity:4500_secure_ip_services_gateway:*:*:*:*:*:*:*
nortel contivity 4600_secure_ip_services_gateway cpe:2.3:h:nortel:contivity:4600_secure_ip_services_gateway:*:*:*:*:*:*:*
nortel vpn_router_1010 — cpe:2.3:h:nortel:vpn_router_1010:*:*:*:*:*:*:*:*
nortel vpn_router_1050 — cpe:2.3:h:nortel:vpn_router_1050:*:*:*:*:*:*:*:*
nortel vpn_router_1100 — cpe:2.3:h:nortel:vpn_router_1100:*:*:*:*:*:*:*:*
nortel vpn_router_1700 — cpe:2.3:h:nortel:vpn_router_1700:*:*:*:*:*:*:*:*
nortel vpn_router_1740 — cpe:2.3:h:nortel:vpn_router_1740:*:*:*:*:*:*:*:*
nortel vpn_router_2700 — cpe:2.3:h:nortel:vpn_router_2700:*:*:*:*:*:*:*:*
nortel vpn_router_5000 — cpe:2.3:h:nortel:vpn_router_5000:*:*:*:*:*:*:*:*
nortel vpn_router_600 — cpe:2.3:h:nortel:vpn_router_600:*:*:*:*:*:*:*:*

References for CVE-2005-1802

cvelogic Threat Intelligence