CVE-2006-0966: NCP Network Communication Secure Client 8.11 Build 146, and possibly other versions, allows local users to cau

Routine

LOW 2.1DOWNGRADE

CVE-2006-0966 is a low-severity flaw (CVSS 2.1) affecting secure client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NCP Network Communication Secure Client 8.11 Build 146, and possibly other versions, allows local users to cause a denial of service (CPU consumption) via a large number of arguments to ncprwsnt.exe, possibly due to a buffer overflow.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-119, CWE-399
Published	2006-03-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ncp network communications

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-03-02 23:02 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

ncp network communications secure client DOWNGRADE

Affected: 8.11_build_146

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.11_build_146

1. Check installed version

apt-cache policy secure-client || rpm -q secure-client || secure-client --version

2. No fixed release: DOWNGRADE to a release before 8.11_build_146 (Debian / Ubuntu)

apt-cache madison secure-client sudo apt install secure-client=<VERSION_BEFORE_8.11_build_146> sudo apt-mark hold secure-client

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list secure-client sudo dnf downgrade secure-client-<VERSION_BEFORE_8.11_build_146> sudo dnf versionlock add secure-client

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-0966?

secure client: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0966 being exploited?

CVE-2006-0966 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-0966 affect?

CVE-2006-0966 affects secure client. Severity is low (CVSS 2.1). NCP Network Communication Secure Client 8.11 Build 146, and possibly other versions, allows local users to cause a denial of service (CPU consumption) via a large number of arguments to ncprwsnt.exe, possibly due to a buffer overflow.

How urgent is CVE-2006-0966?

Priority 15/100. No elevated risk signals yet.

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References

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