CVE-2005-3366: PHP file inclusion vulnerability in index.php in PHP iCalendar 2.0a2 through 2.0.1 allows remote attackers to

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MEDIUM 6.8DOWNGRADE

CVE-2005-3366 is a medium-severity flaw (CVSS 6.8) affecting php icalendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP file inclusion vulnerability in index.php in PHP iCalendar 2.0a2 through 2.0.1 allows remote attackers to execute arbitrary PHP code and include arbitrary local files via the phpicalendar cookie. NOTE: this is not a cross-site scripting (XSS) issue as claimed by the original researcher.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Published	2005-10-30
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: php icalendar

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

Am I affected?

Timeline

2005-10-30 14:34 UTCPublished CVE record published
2026-06-16 22:16 UTCUpdated Record last modified

php icalendar php icalendar DOWNGRADE

Affected: 2.0.1 · 2.0a2 · 2.0b · 2.0c

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.1

1. Check installed version

apt-cache policy php-icalendar || rpm -q php-icalendar || php-icalendar --version

2. No fixed release: DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison php-icalendar sudo apt install php-icalendar=<VERSION_BEFORE_2.0.1> sudo apt-mark hold php-icalendar

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

dnf --showduplicates list php-icalendar sudo dnf downgrade php-icalendar-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add php-icalendar

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-2005-3366?

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

Is CVE-2005-3366 being exploited?

CVE-2005-3366 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-2005-3366 affect?

CVE-2005-3366 affects php icalendar. Severity is medium (CVSS 6.8). PHP file inclusion vulnerability in index.php in PHP iCalendar 2.0a2 through 2.0.1 allows remote attackers to execute arbitrary PHP code and include arbitrary local files via the phpicalendar cookie. NOTE: this is not a cross-site scriptin

How urgent is CVE-2005-3366?

Priority 50/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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