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Apache Tomcat does not enforce the maxHttpHeaderSize limit

High severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Feb 21, 2024

Package

maven org.apache.tomcat:tomcat (Maven)

Affected versions

>= 6.0.0, <= 6.0.30
>= 7.0.0, <= 7.0.6

Patched versions

6.0.32
7.0.8

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.

References

Published by the National Vulnerability Database Feb 10, 2011
Published to the GitHub Advisory Database May 14, 2022
Reviewed Feb 21, 2024
Last updated Feb 21, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

1.214%
(86th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2011-0534

GHSA ID

GHSA-43v2-6grp-9pp9

Source code

Credits

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