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    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 Host header.

    Published:Jun 3, 2009
    Last Modified:Apr 23, 2026
    EPS:Jun 5, 2009
    EPSS Score:0.13832
    CVSS Score:5

    Affected Products

    Vendor
    Apache
    Product
    Tomcat
    Vendor
    Redhat
    Product
    Certificate System
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Enterprise Web Server
    Vendor
    Redhat
    Product
    Network Satellite
    Vendor
    Redhat
    Product
    Rhel Application Server
    Vendor
    Redhat
    Product
    Rhel Developer Suite

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

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    CVE-2026-68763 (CVSS 7.5) — Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog …
    CVE-2026-68569 (CVSS 8.1) — Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPN…
    CVE-2026-68525 (CVSS 9.1) — Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a…
    CVE-2026-66422 (CVSS 8.1) — Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly…
    CVE-2026-65927 (CVSS 7.5) — Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite pr…
    CVE-2026-65905 (CVSS 9.8) — Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before wind…
    CVE-2026-65637 (CVSS 9.8) — Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This iss…
    CVE-2026-65183 (CVSS 8.1) — Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain soc…
    CVE-2026-65182 (CVSS 9.1) — Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint b…

    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
    http://secunia.com/advisories/42368
    http://securitytracker.com/id?1022331
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-263529-1
    http://support.apple.com/kb/HT4077
    http://svn.apache.org/viewvc?rev=742915&view=rev
    http://svn.apache.org/viewvc?rev=781362&view=rev
    http://tomcat.apache.org/security-4.html
    http://tomcat.apache.org/security-5.html
    http://tomcat.apache.org/security-6.html
    http://www.debian.org/security/2011/dsa-2207
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:136
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:138
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:176
    http://www.securityfocus.com/archive/1/504044/100/0/threaded
    http://www.securityfocus.com/archive/1/507985/100/0/threaded
    http://www.securityfocus.com/bid/35193
    http://www.vmware.com/security/advisories/VMSA-2009-0016.html
    http://www.vupen.com/english/advisories/2009/1496
    http://www.vupen.com/english/advisories/2009/1856
    http://www.vupen.com/english/advisories/2009/3316
    http://www.vupen.com/english/advisories/2010/3056
    https://exchange.xforce.ibmcloud.com/vulnerabilities/50928
    https://lists.apache.org/thread.html/06cfb634bc7bf37af7d8f760f118018746ad8efbd519c4b789ac9c2e%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/29dc6c2b625789e70a9c4756b5a327e6547273ff8bde7e0327af48c5%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/8dcaf7c3894d66cb717646ea1504ea6e300021c85bb4e677dc16b1aa%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/c62b0e3a7bf23342352a5810c640a94b6db69957c5c19db507004d74%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/r3aacc40356defc3f248aa504b1e48e819dd0471a0a83349080c6bcbf%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/r584a714f141eff7b1c358d4679288177bd4ca4558e9999d15867d4b5%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3%40%3Cdev.tomcat.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10231
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19110
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5739
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01156.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01216.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01246.html
    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
    http://secunia.com/advisories/42368
    http://securitytracker.com/id?1022331
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-263529-1
    http://support.apple.com/kb/HT4077
    http://svn.apache.org/viewvc?rev=742915&view=rev
    http://svn.apache.org/viewvc?rev=781362&view=rev
    http://tomcat.apache.org/security-4.html
    http://tomcat.apache.org/security-5.html
    http://tomcat.apache.org/security-6.html
    http://www.debian.org/security/2011/dsa-2207
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:136
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:138
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:176
    http://www.securityfocus.com/archive/1/504044/100/0/threaded
    http://www.securityfocus.com/archive/1/507985/100/0/threaded
    http://www.securityfocus.com/bid/35193
    http://www.vmware.com/security/advisories/VMSA-2009-0016.html
    http://www.vupen.com/english/advisories/2009/1496
    http://www.vupen.com/english/advisories/2009/1856
    http://www.vupen.com/english/advisories/2009/3316
    http://www.vupen.com/english/advisories/2010/3056
    https://exchange.xforce.ibmcloud.com/vulnerabilities/50928
    https://lists.apache.org/thread.html/06cfb634bc7bf37af7d8f760f118018746ad8efbd519c4b789ac9c2e%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/29dc6c2b625789e70a9c4756b5a327e6547273ff8bde7e0327af48c5%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/8dcaf7c3894d66cb717646ea1504ea6e300021c85bb4e677dc16b1aa%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/c62b0e3a7bf23342352a5810c640a94b6db69957c5c19db507004d74%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/r3aacc40356defc3f248aa504b1e48e819dd0471a0a83349080c6bcbf%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/r584a714f141eff7b1c358d4679288177bd4ca4558e9999d15867d4b5%40%3Cdev.tomcat.apache.org%3E
    https://lists.apache.org/thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3%40%3Cdev.tomcat.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10231
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19110
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5739
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01156.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01216.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01246.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High