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CVE-2001-0436: dcboard.cgi in DCForum 2000 1.0 allows remote attackers to execute arbitrary commands by uploading a Perl prog

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HIGH 7.5DOWNGRADEDOWNGRADE

CVE-2001-0436 is a high-severity flaw (CVSS 7.5) affecting dcforum, dcforum 2000. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

dcboard.cgi in DCForum 2000 1.0 allows remote attackers to execute arbitrary commands by uploading a Perl program to the server and using a .. (dot dot) in the AZ parameter to reference the program.

Why this priority

  • High severity
  • Public exploit reference

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

Risk facts

CVSS score7.5 (High)
EPSS exploit chance2.4% (top 16%)
CISA exploited listNo
Published2001-07-02
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: dcscripts

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

Am I affected?

Timeline

dcscripts dcforum DOWNGRADE
Affected: 1.0 · 2.0 · 3.0 · 4.0 · 5.0 · 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0
1. Check installed version
apt-cache policy dcforum || rpm -q dcforum || dcforum --version
2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)
apt-cache madison dcforum sudo apt install dcforum=<VERSION_BEFORE_1.0> sudo apt-mark hold dcforum
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list dcforum sudo dnf downgrade dcforum-<VERSION_BEFORE_1.0> sudo dnf versionlock add dcforum
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.
dcscripts dcforum 2000 DOWNGRADE
Affected: 1.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0
1. Check installed version
apt-cache policy dcforum-2000 || rpm -q dcforum-2000 || dcforum-2000 --version
2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)
apt-cache madison dcforum-2000 sudo apt install dcforum-2000=<VERSION_BEFORE_1.0> sudo apt-mark hold dcforum-2000
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list dcforum-2000 sudo dnf downgrade dcforum-2000-<VERSION_BEFORE_1.0> sudo dnf versionlock add dcforum-2000
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-2001-0436?

dcforum: downgrade or apply the listed mitigation; dcforum 2000: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0436 being exploited?

CVE-2001-0436 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-2001-0436 affect?

CVE-2001-0436 affects dcforum, dcforum 2000. Severity is high (CVSS 7.5). dcboard.cgi in DCForum 2000 1.0 allows remote attackers to execute arbitrary commands by uploading a Perl program to the server and using a .. (dot dot) in the AZ parameter to reference the program.

How urgent is CVE-2001-0436?

Priority 52/100. High severity; Public exploit reference

Software pages

Perl vulnerabilities

Related CVEs

References

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