CVE-2000-0555: Ceilidh allows remote attackers to cause a denial of service via a large number of POST requests.

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MEDIUM 5.0DOWNGRADE

CVE-2000-0555 is a medium-severity flaw (CVSS 5.0) affecting ceilidh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ceilidh allows remote attackers to cause a denial of service via a large number of POST requests.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Published	2000-06-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: lilikoi

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

Am I affected?

Timeline

2000-06-09 04:00 UTCPublished CVE record published
2026-06-16 21:51 UTCUpdated Record last modified

lilikoi ceilidh DOWNGRADE

Affected: 2.60

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.60

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.60 (Debian / Ubuntu)

apt-cache madison ceilidh sudo apt install ceilidh=<VERSION_BEFORE_2.60> sudo apt-mark hold ceilidh

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

dnf --showduplicates list ceilidh sudo dnf downgrade ceilidh-<VERSION_BEFORE_2.60> sudo dnf versionlock add ceilidh

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-2000-0555?

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

Is CVE-2000-0555 being exploited?

CVE-2000-0555 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-2000-0555 affect?

CVE-2000-0555 affects ceilidh. Severity is medium (CVSS 5.0). Ceilidh allows remote attackers to cause a denial of service via a large number of POST requests.

How urgent is CVE-2000-0555?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2003-1531 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in testcgi.exe in Lilikoi Software Ceilidh 2.70 and earlier allows re
CVE-2000-0554 MEDIUM 5.0 DOWNGRADE Ceilidh allows remote attackers to obtain the real path of the Ceilidh directory via the translated_path hidde

References

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