CVE-2001-1033: Compaq TruCluster 1.5 allows remote attackers to cause a denial of service via a port scan from a system that

Routine

MEDIUM 5.0DOWNGRADEMITIGATE

CVE-2001-1033 is a medium-severity flaw (CVSS 5.0) affecting trucluster, tru64. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Compaq TruCluster 1.5 allows remote attackers to cause a denial of service via a port scan from a system that does not have a DNS PTR record, which causes the cluster to enter a "split-brain" state.

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	1.6% (top 24%)
CISA exploited list	No
Published	2001-09-25
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: compaq

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

Am I affected?

Timeline

2001-09-25 04:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

compaq trucluster DOWNGRADE

Affected: 1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison trucluster sudo apt install trucluster=<VERSION_BEFORE_1.5> sudo apt-mark hold trucluster

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

dnf --showduplicates list trucluster sudo dnf downgrade trucluster-<VERSION_BEFORE_1.5> sudo dnf versionlock add trucluster

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.

compaq tru64 MITIGATE

Affected: 5.0 · 5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2001-1033?

trucluster: downgrade or apply the listed mitigation; tru64: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-1033 being exploited?

CVE-2001-1033 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-2001-1033 affect?

CVE-2001-1033 affects trucluster, tru64. Severity is medium (CVSS 5.0). Compaq TruCluster 1.5 allows remote attackers to cause a denial of service via a port scan from a system that does not have a DNS PTR record, which causes the cluster to enter a "split-brain" state.

How urgent is CVE-2001-1033?

Priority 36/100. No elevated risk signals yet.

References

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