CVE-2003-0866

mediumpriority · track · 42EPSS 0.348 · 98 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

34.8% (98th) EPSS

CVSS 5 · medium

Is it mine?

9 products

Check your exposure

Who says so?

3 sources

enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.04.5mediumAV:N/AC:L/Au:N/C:N/I:N/A:P/E:POCsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-23245Apache Tomcat 4.0.x - Non-HTTP Request Denial of Servicefunctional · exploit_db

affected products (9)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache tomcat= 4.0.0nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.1nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.2nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.3nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.4nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.5nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 4.0.6nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
Maven org.apache.tomcat:tomcat4.0 → 4.1.0osvUSpkg:maven/org.apache.tomcat/tomcat

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-7wj2-48c4-2684Apache Tomcat Denial of Service vulnerability in the Catalina package2022-04-29ghsa · osvUS
The Catalina org.apache.catalina.connector.http package in Tomcat 4.0.x up to 4.0.6 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.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd osv NVD CVE.org MITRE

published 2003-11-17modified 2026-06-16

references (24)

External citations — patches, advisories, analysis.

scry

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