CVE-2004-0766: NGSEC StackDefender 2.0 allows attackers to cause a denial of service (system crash) via an invalid address fo

Routine

MEDIUM 5.0DOWNGRADE

CVE-2004-0766 is a medium-severity flaw (CVSS 5.0) affecting stackdefender. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NGSEC StackDefender 2.0 allows attackers to cause a denial of service (system crash) via an invalid address for the BaseAddress parameter to the hooks for the (1) ZwAllocateVirtualMemory or (2) ZwProtectVirtualMemory functions.

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	1.0% (top 36%)
CISA exploited list	No
Published	2004-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ngsec

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

Am I affected?

Timeline

2004-08-18 04:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

ngsec stackdefender DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison stackdefender sudo apt install stackdefender=<VERSION_BEFORE_2.0> sudo apt-mark hold stackdefender

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

dnf --showduplicates list stackdefender sudo dnf downgrade stackdefender-<VERSION_BEFORE_2.0> sudo dnf versionlock add stackdefender

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-2004-0766?

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

Is CVE-2004-0766 being exploited?

CVE-2004-0766 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-2004-0766 affect?

CVE-2004-0766 affects stackdefender. Severity is medium (CVSS 5.0). NGSEC StackDefender 2.0 allows attackers to cause a denial of service (system crash) via an invalid address for the BaseAddress parameter to the hooks for the (1) ZwAllocateVirtualMemory or (2) ZwProtectVirtualMemory functions.

How urgent is CVE-2004-0766?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2004-0767 MEDIUM 5.0 DOWNGRADE NGSEC StackDefender 1.10 allows attackers to cause a denial of service (system crash) via an invalid address f

References

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