CVE-2006-5721: The \Device\SandBox driver in Outpost Firewall PRO 4.0 (964.582.059) allows local users to cause a denial of s

Routine

MEDIUM 4.9DOWNGRADE

CVE-2006-5721 is a medium-severity flaw (CVSS 4.9) affecting outpost firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The \Device\SandBox driver in Outpost Firewall PRO 4.0 (964.582.059) allows local users to cause a denial of service (system crash) via an invalid argument to the DeviceIoControl function that triggers an invalid memory operation.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.9 (Medium)
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Published	2006-11-04
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

2006-11-04 01:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

agnitum outpost firewall DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

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 4.0 (Debian / Ubuntu)

apt-cache madison outpost-firewall sudo apt install outpost-firewall=<VERSION_BEFORE_4.0> 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_4.0> 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: Outpost Firewall PRO 4.0 - 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-2006-5721?

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

Is CVE-2006-5721 being exploited?

CVE-2006-5721 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-2006-5721 affect?

CVE-2006-5721 affects outpost firewall. Severity is medium (CVSS 4.9). The \Device\SandBox driver in Outpost Firewall PRO 4.0 (964.582.059) allows local users to cause a denial of service (system crash) via an invalid argument to the DeviceIoControl function that triggers an invalid memory operation.

How urgent is CVE-2006-5721?

Priority 38/100. 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-2006-3697 HIGH 7.2 DOWNGRADE DOWNGRADE Agnitum Outpost Firewall Pro 3.51.759.6511 (462), as used in (1) Lavasoft Personal Firewall 1.0.543.5722 (433)

References

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