CVE-2012-2733

What it is

java/org/apache/coyote/http11/InternalNioInputBuffer.java in the HTTP NIO connector in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28 does not properly restrict the request-header size, which allows remote attackers to cause a denial of service (memory consumption) via a large amount of header data.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

8.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2012-11-16 21:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:41 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.7% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2012-11-16 21:55 UTC

Last modified

2026-06-16 23:41 UTC

Exploit probability

8.7% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Apache Tomcat 6.0
• Apache Tomcat 6.0.0
• Apache Tomcat 6.0.1
• Apache Tomcat 6.0.2
• Apache Tomcat 6.0.3
• Apache Tomcat 6.0.4
• Apache Tomcat 6.0.5
• Apache Tomcat 6.0.6

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

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