CVE-2006-3551

critical

Description

NCP Secure Enterprise Client (aka VPN/PKI client) 8.30 Build 59, and possibly earlier versions, when the Link Firewall and Personal Firewall are both configured to block all inbound and outbound network traffic, allows context-dependent attackers to send inbound UDP traffic with source port 67 and destination port 68, and outbound UDP traffic with source port 68 and destination port 67.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/27484

http://lists.grok.org.uk/pipermail/full-disclosure/2006-June/047547.html

Details

Source: Mitre, NVD

Published: 2006-07-13

Updated: 2026-04-16

Risk Information

CVSS v2

Base Score: 1.2

Vector: CVSS2#AV:L/AC:H/Au:N/C:N/I:P/A:N

Severity: Low

CVSS v3

Base Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: Critical

EPSS

EPSS: 0.00071