CVE-2003-0866

CVE-2003-0866 is a medium-severity vulnerability in Apache Tomcat with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 33% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

The Catalina org.apache.catalina.connector.http package in Tomcat 4.0.x up to 4.0.3 allows remote attackers to cause a denial of service via several requests that do not follow the HTTP protocol, which causes Tomcat to reject later requests.

Frequently asked questions

What is CVE-2003-0866?
The Catalina org.apache.catalina.connector.http package in Tomcat 4.0.x up to 4.0.3 allows remote attackers to cause a denial of service via several requests that do not follow the HTTP protocol, which causes Tomcat to reject later requests.
How severe is CVE-2003-0866?
CVE-2003-0866 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2003-0866 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0866?
CVE-2003-0866 primarily affects Apache Tomcat. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0866?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-0866 published?
CVE-2003-0866 was published on 2003-11-17 and last updated on 2026-06-16.

References

Affected products (7)

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