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Fencer Vulns
medium 5.0

CVE-2009-0033 json

Apache Tomcat Denial of Service via Malformed Request Headers

published 2009-06-05 17 y ago modified 2026-06-16 4 mo ago also GHSA-5cw4-ggx9-36vg , EUVD-2022-2567

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.1%
EPSS 10.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • ant certificate system 7.3 1.6.5-1jpp_1rh
  • axis certificate system 7.3 1.2.1-1jpp_3rh
  • mx4j certificate system 7.3 1:3.0.1-1jpp_4rh
  • log4j certificate system 7.3 1.2.12-1jpp_1rh
  • tomcat5 RHEL 2 APPLICATION_SERVER, certificate system 7.3 5.5.23-0jpp_4rh.16
  • rhpki-ca certificate system 7.3 7.3.0-20.el4
  • pcsc-lite certificate system 7.3 1.3.3-3.el4
  • rhpki-kra certificate system 7.3 7.3.0-14.el4

red hat advisories RHSA-2010:0602RHSA-2009:1617RHSA-2009:1616RHSA-2009:1563RHSA-2009:1562RHSA-2009:1506

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0033 updated cvss 5.0

tomcat6 Denial-Of-Service with AJP connection

  • Red Hat Application Server v2 4AS tomcat5 5.5.23-0jpp_4rh.16, tomcat5-jasper 5.5.23-0jpp_4rh.16, tomcat5-webapps 5.5.23-0jpp_4rh.16, tomcat5-common-lib 5.5.23-0jpp_4rh.16, tomcat5-server-lib 5.5.23-0jpp_4rh.16, tomcat5-jsp-2.0-api 5.5.23-0jpp_4rh.16, +5 more Red Hat Application Server v2 4ES tomcat5 5.5.23-0jpp_4rh.16, tomcat5-jasper 5.5.23-0jpp_4rh.16, tomcat5-webapps 5.5.23-0jpp_4rh.16, tomcat5-common-lib 5.5.23-0jpp_4rh.16, tomcat5-server-lib 5.5.23-0jpp_4rh.16, tomcat5-jsp-2.0-api 5.5.23-0jpp_4rh.16, +5 more Red Hat Application Server v2 4WS tomcat5 5.5.23-0jpp_4rh.16, tomcat5-jasper 5.5.23-0jpp_4rh.16, tomcat5-webapps 5.5.23-0jpp_4rh.16, tomcat5-common-lib 5.5.23-0jpp_4rh.16, tomcat5-server-lib 5.5.23-0jpp_4rh.16, tomcat5-jsp-2.0-api 5.5.23-0jpp_4rh.16, +5 more
    fixed: vendor fix RHSA-2009:1562
  • Red Hat Certificate System 7.3 for 4AS ant 1.6.5-1jpp_1rh, axis 1.2.1-1jpp_3rh, mx4j 3.0.1-1jpp_4rh, log4j 1.2.12-1jpp_1rh, pcsc-lite 1.3.3-3.el4, rhpki-ca 7.3.0-20.el4, +31 more Red Hat Certificate System 7.3 for 4ES ant 1.6.5-1jpp_1rh, axis 1.2.1-1jpp_3rh, mx4j 3.0.1-1jpp_4rh, log4j 1.2.12-1jpp_1rh, pcsc-lite 1.3.3-3.el4, rhpki-ca 7.3.0-20.el4, +31 more
    fixed: vendor fix RHSA-2010:0602
  • Red Hat Developer Suite v.3 (AS v.4) tomcat5 5.5.23-0jpp_18rh, tomcat5-jasper 5.5.23-0jpp_18rh, tomcat5-common-lib 5.5.23-0jpp_18rh, tomcat5-server-lib 5.5.23-0jpp_18rh, tomcat5-jsp-2.0-api 5.5.23-0jpp_18rh, tomcat5-servlet-2.4-api 5.5.23-0jpp_18rh
    fixed: vendor fix RHSA-2009:1563
  • Red Hat Enterprise Linux (v. 5 server) tomcat5 5.5.23-0jpp.7.el5_3.2, tomcat5-jasper 5.5.23-0jpp.7.el5_3.2, tomcat5-webapps 5.5.23-0jpp.7.el5_3.2, tomcat5-common-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-server-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-jsp-2.0-api 5.5.23-0jpp.7.el5_3.2, +5 more Red Hat Enterprise Linux Desktop (v. 5 client) tomcat5 5.5.23-0jpp.7.el5_3.2, tomcat5-jasper 5.5.23-0jpp.7.el5_3.2, tomcat5-webapps 5.5.23-0jpp.7.el5_3.2, tomcat5-common-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-server-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-jsp-2.0-api 5.5.23-0jpp.7.el5_3.2, +5 more Red Hat Enterprise Linux Desktop Workstation (v. 5 client) tomcat5 5.5.23-0jpp.7.el5_3.2, tomcat5-jasper 5.5.23-0jpp.7.el5_3.2, tomcat5-webapps 5.5.23-0jpp.7.el5_3.2, tomcat5-common-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-server-lib 5.5.23-0jpp.7.el5_3.2, tomcat5-jsp-2.0-api 5.5.23-0jpp.7.el5_3.2, +5 more
    fixed: vendor fix RHSA-2009:1164
  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server tomcat6 6.0.18-12.0.ep5.el5, tomcat5 5.5.23-0jpp.9.6.ep5.el5, tomcat6-lib 6.0.18-12.0.ep5.el5, tomcat6-log4j 6.0.18-12.0.ep5.el5, tomcat6-javadoc 6.0.18-12.0.ep5.el5, tomcat6-webapps 6.0.18-12.0.ep5.el5, +15 more Red Hat JBoss Web Server 1.0 for RHEL 4 AS tomcat6 6.0.18-11.3.ep5.el4, tomcat6-lib 6.0.18-11.3.ep5.el4, tomcat6-log4j 6.0.18-11.3.ep5.el4, tomcat5 5.5.23-1.patch07.19.ep5.el4, tomcat6-javadoc 6.0.18-11.3.ep5.el4, tomcat6-webapps 6.0.18-11.3.ep5.el4, +15 more Red Hat JBoss Web Server 1.0 for RHEL 4 ES tomcat6 6.0.18-11.3.ep5.el4, tomcat6-lib 6.0.18-11.3.ep5.el4, tomcat6-log4j 6.0.18-11.3.ep5.el4, tomcat5 5.5.23-1.patch07.19.ep5.el4, tomcat6-javadoc 6.0.18-11.3.ep5.el4, tomcat6-webapps 6.0.18-11.3.ep5.el4, +15 more
    fixed: vendor fix RHSA-2009:1454
  • Red Hat Satellite 5.1 (RHEL v.4 AS) tomcat5 5.0.30-0jpp_16rh
    fixed: vendor fix RHSA-2009:1617
  • Red Hat Satellite 5.2 (RHEL v.4 AS) tomcat5 5.5.23-0jpp_18rh, tomcat5-jasper 5.5.23-0jpp_18rh, tomcat5-common-lib 5.5.23-0jpp_18rh, tomcat5-server-lib 5.5.23-0jpp_18rh, tomcat5-jsp-2.0-api 5.5.23-0jpp_18rh, tomcat5-servlet-2.4-api 5.5.23-0jpp_18rh Red Hat Satellite 5.3 (RHEL v.4) tomcat5 5.5.23-0jpp_18rh, tomcat5-jasper 5.5.23-0jpp_18rh, tomcat5-common-lib 5.5.23-0jpp_18rh, tomcat5-server-lib 5.5.23-0jpp_18rh, tomcat5-jsp-2.0-api 5.5.23-0jpp_18rh, tomcat5-servlet-2.4-api 5.5.23-0jpp_18rh
    fixed: vendor fix RHSA-2009:1616

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

10.05% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat
>=4.1.0, <=4.1.39
>=5.5.0, <=5.5.27
>=6.0.0, <=6.0.18
 no fix listed

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.