CVE-2009-0033

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 10.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-06-05 · updated 2026-06-16
Weakness: CWE-20

Description

Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when the Java AJP connector and mod_jk load balancing are used, allows remote attackers to cause a denial of service (application outage) via a crafted request with invalid headers, related to temporary blocking of connectors that have encountered errors, as demonstrated by an error involving a malformed HTTP Host header.

Affected products

Apache Tomcat: 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.3-beta, 4.1.4 (+81)

References

http://jvn.jp/en/jp/JVN87272440/index.html
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
http://marc.info/?l=bugtraq&m=127420533226623&w=2
http://marc.info/?l=bugtraq&m=129070310906557&w=2
http://marc.info/?l=bugtraq&m=133469267822771&w=2
http://marc.info/?l=bugtraq&m=136485229118404&w=2
http://secunia.com/advisories/35326
http://secunia.com/advisories/35344
http://secunia.com/advisories/35685
http://secunia.com/advisories/35788
http://secunia.com/advisories/37460

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