CVE-2006-3696: filtnt.sys in Outpost Firewall Pro before 3.51.759.6511 (462) allows local users to cause a denial of service

Routine

LOW 2.1DOWNGRADE

CVE-2006-3696 is a low-severity flaw (CVSS 2.1) affecting outpost firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

filtnt.sys in Outpost Firewall Pro before 3.51.759.6511 (462) allows local users to cause a denial of service (crash) via long arguments to mshta.exe.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Published	2006-07-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: agnitum

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

Am I affected?

Timeline

2006-07-21 14:03 UTCPublished CVE record published
2026-06-16 22:27 UTCUpdated Record last modified

agnitum outpost firewall DOWNGRADE

Affected: 3.5.631

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.631

1. Check installed version

apt-cache policy outpost-firewall || rpm -q outpost-firewall || outpost-firewall --version

2. No fixed release: DOWNGRADE to a release before 3.5.631 (Debian / Ubuntu)

apt-cache madison outpost-firewall sudo apt install outpost-firewall=<VERSION_BEFORE_3.5.631> sudo apt-mark hold outpost-firewall

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

dnf --showduplicates list outpost-firewall sudo dnf downgrade outpost-firewall-<VERSION_BEFORE_3.5.631> sudo dnf versionlock add outpost-firewall

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Agnitum Outpost Firewall 3.5.631 - 'FiltNT.SYS' Local Denial of Service

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-2006-3696?

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

Is CVE-2006-3696 being exploited?

CVE-2006-3696 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-2006-3696 affect?

CVE-2006-3696 affects outpost firewall. Severity is low (CVSS 2.1). filtnt.sys in Outpost Firewall Pro before 3.51.759.6511 (462) allows local users to cause a denial of service (crash) via long arguments to mshta.exe.

How urgent is CVE-2006-3696?

Priority 26/100. Public exploit reference

Related CVEs

CVE-2007-5042 MEDIUM 4.6 DOWNGRADE Outpost Firewall Pro 4.0.1025.7828 does not properly validate certain parameters to System Service Descriptor
CVE-2007-3086 MEDIUM 4.9 DOWNGRADE Unrestricted critical resource lock in Agnitum Outpost Firewall PRO 4.0 1007.591.145 and earlier allows local
CVE-2007-0333 HIGH 7.2 DOWNGRADE Agnitum Outpost Firewall PRO 4.0 allows local users to bypass access restrictions and insert Trojan horse driv
CVE-2006-7160 MEDIUM 4.9 UPGRADE The Sandbox.sys driver in Outpost Firewall PRO 4.0, and possibly earlier versions, does not validate arguments
CVE-2006-5721 MEDIUM 4.9 DOWNGRADE The \Device\SandBox driver in Outpost Firewall PRO 4.0 (964.582.059) allows local users to cause a denial of s

References

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