CVE-2005-4222: Multiple cross-site scripting (XSS) vulnerabilities in guestbook.cgi in Lars Ellingsen Guestserver 4.13 and ea

Routine

MEDIUM 4.3DOWNGRADE

CVE-2005-4222 is a medium-severity flaw (CVSS 4.3) affecting guestserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in guestbook.cgi in Lars Ellingsen Guestserver 4.13 and earlier allow remote attackers to inject arbitrary web script or HTML via unspecified message fields.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Published	2005-12-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: lars ellingsen

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

Am I affected?

Timeline

2005-12-14 11:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

lars ellingsen guestserver DOWNGRADE

Affected: 2.07 · 2.10 · 2.90 · 3.01 · 3.02 · 3.03 · 3.10 · 3.20

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.07

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.07 (Debian / Ubuntu)

apt-cache madison guestserver sudo apt install guestserver=<VERSION_BEFORE_2.07> sudo apt-mark hold guestserver

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

dnf --showduplicates list guestserver sudo dnf downgrade guestserver-<VERSION_BEFORE_2.07> sudo dnf versionlock add guestserver

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-2005-4222?

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

Is CVE-2005-4222 being exploited?

CVE-2005-4222 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-2005-4222 affect?

CVE-2005-4222 affects guestserver. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in guestbook.cgi in Lars Ellingsen Guestserver 4.13 and earlier allow remote attackers to inject arbitrary web script or HTML via unspecified message fields.

How urgent is CVE-2005-4222?

Priority 30/100. No elevated risk signals yet.

Related CVEs

CVE-2001-0180 HIGH 10.0 UPGRADE Lars Ellingsen guestserver.cgi allows remote attackers to execute arbitrary commands via shell metacharacters

References

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