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Servers and applications

CVE-2009-0033

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…

Severity
Medium 5.0
Published
5 Jun 2009
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
10% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
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

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.

From NVD.

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • Version 6.0.16
  • Version 6.0.15
  • Version 6.0.14
  • Version 6.0.13
All 87 release lines
  • Version 4.1.0
  • Version 4.1.1
  • Version 4.1.2
  • Version 4.1.3-beta
  • Version 4.1.3
  • Version 4.1.4
  • Version 4.1.5
  • Version 4.1.6
  • Version 4.1.7
  • Version 4.1.8
  • Version 4.1.9-beta
  • Version 4.1.9
  • Version 4.1.10
  • Version 4.1.11
  • Version 4.1.12
  • Version 4.1.13
  • Version 4.1.14
  • Version 4.1.15
  • Version 4.1.16
  • Version 4.1.17
  • Version 4.1.18
  • Version 4.1.19
  • Version 4.1.20
  • Version 4.1.21
  • Version 4.1.22
  • Version 4.1.23
  • Version 4.1.24
  • Version 4.1.25
  • Version 4.1.26
  • Version 4.1.27
  • Version 4.1.28
  • Version 4.1.29
  • Version 4.1.30
  • Version 4.1.31
  • Version 4.1.32
  • Version 4.1.33
  • Version 4.1.34
  • Version 4.1.35
  • Version 4.1.36
  • Version 4.1.37
  • Version 4.1.38
  • Version 4.1.39
  • Version 5.5.0
  • Version 5.5.1
  • Version 5.5.2
  • Version 5.5.3
  • Version 5.5.4
  • Version 5.5.5
  • Version 5.5.6
  • Version 5.5.7
  • Version 5.5.8
  • Version 5.5.9
  • Version 5.5.10
  • Version 5.5.11
  • Version 5.5.12
  • Version 5.5.13
  • Version 5.5.14
  • Version 5.5.15
  • Version 5.5.16
  • Version 5.5.17
  • Version 5.5.18
  • Version 5.5.19
  • Version 5.5.20
  • Version 5.5.21
  • Version 5.5.22
  • Version 5.5.23
  • Version 5.5.24
  • Version 5.5.25
  • Version 5.5.26
  • Version 5.5.27
  • Version 6.0.0
  • Version 6.0.1
  • Version 6.0.2
  • Version 6.0.3
  • Version 6.0.4
  • Version 6.0.5
  • Version 6.0.6
  • Version 6.0.7
  • Version 6.0.8
  • Version 6.0.9
  • Version 6.0.10
  • Version 6.0.11
  • Version 6.0.12
  • Version 6.0.13
  • Version 6.0.14
  • Version 6.0.15
  • Version 6.0.16

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-0033
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-0033