How severe is CVE-2006-3551?

CVE-2006-3551 has a CVSS 2.0 base score of 1.2, rated low severity.

Is CVE-2006-3551 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-3551?

CVE-2006-3551 affects Ncp Network Communications Secure Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-3551?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2006-3551 published?

CVE-2006-3551 was published on 2006-07-13 and last updated on 2026-06-16.

CVE-2006-3551

CVE-2006-3551 is a low-severity vulnerability in Ncp Network Communications Secure Client with a CVSS 2.0 base score of 1.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 1.2)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ncp Network Communications Secure Client
Published: 2006-07-13
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2006-3551?: 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.
How severe is CVE-2006-3551?: CVE-2006-3551 has a CVSS 2.0 base score of 1.2, rated low severity.
Is CVE-2006-3551 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-3551?: CVE-2006-3551 affects Ncp Network Communications Secure Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-3551?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-3551 published?: CVE-2006-3551 was published on 2006-07-13 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:ncp_network_communications:secure_client:*:*:*:*:*:*:*:*

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