CVE-2004-1400: The control panel in ASP Calendar does not require authentication to access, which allows remote attackers to

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HIGH 7.5DOWNGRADE

CVE-2004-1400 is a high-severity flaw (CVSS 7.5) affecting asp calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The control panel in ASP Calendar does not require authentication to access, which allows remote attackers to gain unauthorized access via a direct request to main.asp.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.2% (top 6%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: active server corner

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:07 UTCUpdated Record last modified

active server corner asp calendar 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 asp-calendar || rpm -q asp-calendar || asp-calendar --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison asp-calendar sudo apt install asp-calendar=<VERSION_BEFORE_1.0> sudo apt-mark hold asp-calendar

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

dnf --showduplicates list asp-calendar sudo dnf downgrade asp-calendar-<VERSION_BEFORE_1.0> sudo dnf versionlock add asp-calendar

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: Active Server Corner ASP Calendar 1.0 - Administrative Access

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-2004-1400?

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

Is CVE-2004-1400 being exploited?

CVE-2004-1400 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-2004-1400 affect?

CVE-2004-1400 affects asp calendar. Severity is high (CVSS 7.5). The control panel in ASP Calendar does not require authentication to access, which allows remote attackers to gain unauthorized access via a direct request to main.asp.

How urgent is CVE-2004-1400?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

References

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