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Servers and applications

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.

Severity
Medium 5.0
Published
17 Nov 2003
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
35% in the next 30 daysHigher than 98% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • Version 4.0.6
  • Version 4.0.5
  • Version 4.0.4
  • Version 4.0.3
All 7 release lines
  • Version 4.0.0
  • Version 4.0.1
  • Version 4.0.2
  • Version 4.0.3
  • Version 4.0.4
  • Version 4.0.5
  • Version 4.0.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0866