CVE-2006-5417: McAfee Network Agent (mcnasvc.exe) 1.0.178.0, as used by multiple McAfee products possibly including Internet

Routine

MEDIUM 5.0MITIGATEDOWNGRADEMITIGATE

CVE-2006-5417 is a medium-severity flaw (CVSS 5.0) affecting internet security suite, network agent, personal firewall plus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

McAfee Network Agent (mcnasvc.exe) 1.0.178.0, as used by multiple McAfee products possibly including Internet Security Suite, Personal Firewall Plus, and VirusScan, allows remote attackers to cause a denial of service (agent crash) via a long packet, possibly because of an invalid string position field value. NOTE: some of these details are obtained from third party information.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Published	2006-10-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mcafee

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

Am I affected?

Timeline

2006-10-20 14:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

mcafee internet security suite MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy internet-security-suite || rpm -q internet-security-suite || internet-security-suite --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

mcafee network agent DOWNGRADE

Affected: 1.0.178.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.178.0

1. Check installed version

apt-cache policy network-agent || rpm -q network-agent || network-agent --version

2. No fixed release: DOWNGRADE to a release before 1.0.178.0 (Debian / Ubuntu)

apt-cache madison network-agent sudo apt install network-agent=<VERSION_BEFORE_1.0.178.0> sudo apt-mark hold network-agent

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

dnf --showduplicates list network-agent sudo dnf downgrade network-agent-<VERSION_BEFORE_1.0.178.0> sudo dnf versionlock add network-agent

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.

mcafee personal firewall plus MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy personal-firewall-plus || rpm -q personal-firewall-plus || personal-firewall-plus --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

mcafee virusscan MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy virusscan || rpm -q virusscan || virusscan --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2006-5417?

internet security suite: mitigate or apply the listed mitigation; network agent: downgrade or apply the listed mitigation; personal firewall plus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5417 being exploited?

CVE-2006-5417 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-2006-5417 affect?

CVE-2006-5417 affects internet security suite, network agent, personal firewall plus. Severity is medium (CVSS 5.0). McAfee Network Agent (mcnasvc.exe) 1.0.178.0, as used by multiple McAfee products possibly including Internet Security Suite, Personal Firewall Plus, and VirusScan, allows remote attackers to cause a denial of service (agent crash) via a lo

How urgent is CVE-2006-5417?

Priority 37/100. No elevated risk signals yet.

Software pages

McAfee vulnerabilities

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References

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