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CVE-2009-0033

24
FAUCET Score

CVE-2009-0033 is a denial-of-service vulnerability affecting Apache Tomcat versions 4.1.0-4.1.39, 5.5.0-5.5.27, and 6.0.0-6.0.18 when using the Java AJP connector and mod_jk load balancing. An unauthenticated remote attacker can exploit this by sending a crafted request with invalid headers, such as a malformed HTTP Host header, leading to a temporary application outage. The CVSS score is 5.0 (medium severity), indicating a network-based attack with low complexity and potential for partial availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.1.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:4.1.0:*:*:*:*:*:*:*
4.1.1CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:4.1.1:*:*:*:*:*:*:*
4.1.2CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:4.1.2:*:*:*:*:*:*:*
4.1.3CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:4.1.3:*:*:*:*:*:*:*
4.1.3CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:4.1.3:beta:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
10.05%
Probability of exploitation in next 30 days
EPSS Percentile
95.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1005 is in the 94th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (30)

redhatpatch availablevia redhat_api
Product: JBEWS 1.0 for RHEL 4Fixed in: tomcat5-0:5.5.23-1.patch07.19.ep5.el4
View patch
redhatpatch availablevia redhat_api
Product: JBEWS 1.0 for RHEL 4Fixed in: tomcat6-0:6.0.18-11.3.ep5.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: ant-0:1.6.5-1jpp_1rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: avalon-logkit-0:1.2-2jpp_4rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: axis-0:1.2.1-1jpp_3rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: classpathx-jaf-0:1.0-2jpp_6rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: classpathx-mail-0:1.1.1-2jpp_8rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: geronimo-specs-0:1.0-0.M4.1jpp_10rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: jakarta-commons-modeler-0:2.0-3jpp_2rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: log4j-0:1.2.12-1jpp_1rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: mx4j-1:3.0.1-1jpp_4rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: pcsc-lite-0:1.3.3-3.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-ca-0:7.3.0-20.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-java-tools-0:7.3.0-10.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-kra-0:7.3.0-14.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-manage-0:7.3.0-19.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-native-tools-0:7.3.0-6.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-ocsp-0:7.3.0-13.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: rhpki-tks-0:7.3.0-13.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: tomcat5-0:5.5.23-0jpp_4rh.16
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: xerces-j2-0:2.7.1-1jpp_1rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Certificate System 7.3Fixed in: xml-commons-0:1.3.02-2jpp_1rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Developer Suite V.3Fixed in: tomcat5-0:5.5.23-0jpp_18rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: tomcat5-0:5.5.23-0jpp.7.el5_3.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 5Fixed in: tomcat5-0:5.5.23-0jpp.9.6.ep5.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 5Fixed in: tomcat6-0:6.0.18-12.0.ep5.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Network Satellite Server v 5.1Fixed in: tomcat5-0:5.0.30-0jpp_16rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Network Satellite Server v 5.2Fixed in: tomcat5-0:5.5.23-0jpp_18rh
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Network Satellite Server v 5.3Fixed in: tomcat5-0:5.5.23-0jpp_18rh
View patch
redhatpatch availablevia redhat_api
Product: RHAPS Version 2 for RHEL 4Fixed in: tomcat5-0:5.5.23-0jpp_4rh.16
View patch

Vendor Advisories (2)

mavenGHSA-5cw4-ggx9-36vgmedium

Apache Tomcat Denial of Service via Malformed Request Headers

May 2, 2022
redhatCVE-2009-0033Important

tomcat6 Denial-Of-Service with AJP connection

Jun 3, 2009

References

jvn.jp / en/jp/JVN87272440/index.html
lists.apple.com / archives/security-announce/2010//Mar/msg00001.html
lists.opensuse.org / opensuse-security-announce/2009-07/msg00002.html
marc.info
marc.info
marc.info
marc.info
secunia.com / advisories/35326
Vendor Advisory
secunia.com / advisories/35344
Vendor Advisory
secunia.com / advisories/35685
secunia.com / advisories/35788
secunia.com / advisories/37460
secunia.com / advisories/42368
securitytracker.com / id
exchange.xforce.ibmcloud.com / vulnerabilities/50928
lists.apache.org / thread.html/06cfb634bc7bf37af7d8f760f118018746ad8efbd519c4b789ac9c2e%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/29dc6c2b625789e70a9c4756b5a327e6547273ff8bde7e0327af48c5%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/8dcaf7c3894d66cb717646ea1504ea6e300021c85bb4e677dc16b1aa%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/c62b0e3a7bf23342352a5810c640a94b6db69957c5c19db507004d74%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/r3aacc40356defc3f248aa504b1e48e819dd0471a0a83349080c6bcbf%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/r584a714f141eff7b1c358d4679288177bd4ca4558e9999d15867d4b5%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3%40%3Cdev.tomcat.apache.org%3E
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10231
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19110
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5739
sunsolve.sun.com / search/document.do
support.apple.com / kb/HT4077
svn.apache.org / viewvc
PatchVendor Advisory
svn.apache.org / viewvc
PatchVendor Advisory
redhat.com / archives/fedora-package-announce/2009-November/msg01156.html
redhat.com / archives/fedora-package-announce/2009-November/msg01216.html
redhat.com / archives/fedora-package-announce/2009-November/msg01246.html
tomcat.apache.org / security-4.html
PatchVendor Advisory
tomcat.apache.org / security-5.html
PatchVendor Advisory
tomcat.apache.org / security-6.html
PatchVendor Advisory
debian.org / security/2011/dsa-2207
mandriva.com / security/advisories
mandriva.com / security/advisories
mandriva.com / security/advisories
securityfocus.com / archive/1/504044/100/0/threaded
securityfocus.com / archive/1/507985/100/0/threaded
securityfocus.com / bid/35193
Patch
vmware.com / security/advisories/VMSA-2009-0016.html
vupen.com / english/advisories/2009/1496
PatchVendor Advisory
vupen.com / english/advisories/2009/1856
vupen.com / english/advisories/2009/3316
vupen.com / english/advisories/2010/3056