Description
Apache Tomcat 7.0.0 through 7.0.6 and 6.0.0 through 6.0.30 does not enforce the maxHttpHeaderSize limit for requests involving the NIO HTTP connector, which allows remote attackers to cause a denial of service (OutOfMemoryError) via a crafted request.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | tomcat6 | 6.0.28-9+squeeze1 | DSA-2160-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | tomcat6 +9 | 6.0.24-24.el6_0 | RHSA-2011:0335 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 1 | tomcat6 +9 | 6.0.24-11.patch_03.ep5.el4 | RHSA-2011:0348 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >= 6.0.0, < 6.0.32 | 6.0.32 | GHSA-43v2-6grp-9pp9 |
| Maven | org.apache.tomcat:tomcat | >= 7.0.0, < 7.0.8 | 7.0.8 | GHSA-43v2-6grp-9pp9 |
Advisories 3
- RHSA-2011:0348 Red Hat Security Advisory: tomcat6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2011:0335 Red Hat Security Advisory: tomcat6 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-2160-1 tomcat6 - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 8074 third-party-advisory
- 1025027 vdb-entry
- 45022 third-party-advisory
- SUSE-SR:2011:005 vendor-advisory
- 70809 vdb-entry
- 20110205 [SECURITY] CVE-2011-0534 Apache Tomcat DoS vulnerability mailing-list
- APPLE-SA-2011-10-12-3 vendor-advisory
- ADV-2011-0293 vdb-entry
- 57126 third-party-advisory
- tomcat-nio-connector-dos(65162) vdb-entry
- 46164 vdb-entry
- 43192 third-party-advisory
- DSA-2160 vendor-advisory
- http://support.apple.com/kb/HT5002
- http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.8_%28released_5_Feb_2011%29
- HPSBST02955 vendor-advisory
- http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5098550.html
- http://tomcat.apache.org/security-6.html#Fixed_in_Apache_Tomcat_6.0.32