// For flags

CVE-2024-34750

Apache Tomcat: HTTP/2 excess header handling DoS

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

Improper Handling of Exceptional Conditions, Uncontrolled Resource Consumption vulnerability in Apache Tomcat. When processing an HTTP/2 stream, Tomcat did not handle some cases of excessive HTTP headers correctly. This led to a miscounting of active HTTP/2 streams which in turn led to the use of an incorrect infinite timeout which allowed connections to remain open which should have been closed.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M20, from 10.1.0-M1 through 10.1.24, from 9.0.0-M1 through 9.0.89.

Users are recommended to upgrade to version 11.0.0-M21, 10.1.25 or 9.0.90, which fixes the issue.

Manejo inadecuado de condiciones excepcionales, vulnerabilidad de consumo incontrolado de recursos en Apache Tomcat. Al procesar una secuencia HTTP/2, Tomcat no manejó correctamente algunos casos de encabezados HTTP excesivos. Esto llevó a un conteo erróneo de flujos HTTP/2 activos que a su vez llevó al uso de un tiempo de espera infinito incorrecto que permitió que las conexiones permanecieran abiertas y que deberían haberse cerrado. Este problema afecta a Apache Tomcat: desde 11.0.0-M1 hasta 11.0.0-M20, desde 10.1.0-M1 hasta 10.1.24, desde 9.0.0-M1 hasta 9.0.89. Se recomienda a los usuarios actualizar a la versión 11.0.0-M21, 10.1.25 o 9.0.90, que soluciona el problema.

A vulnerability was found in Apache Tomcat. When processing an HTTP/2 stream, Tomcat did not handle some cases of excessive HTTP headers correctly. This issue led to a miscounting of active HTTP/2 streams, which in turn led to using an incorrect infinite timeout that allowed connections to remain open that should have been closed.

*Credits: devme4f from VNPT-VCI
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-08 CVE Reserved
  • 2024-07-03 CVE Published
  • 2024-07-04 EPSS Updated
  • 2024-08-16 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
  • CWE-755: Improper Handling of Exceptional Conditions
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache Software Foundation
Search vendor "Apache Software Foundation"
Apache Tomcat
Search vendor "Apache Software Foundation" for product "Apache Tomcat"
>= 11.0.0-M1 <= 11.0.0-M20
Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 11.0.0-M1 <= 11.0.0-M20"
en
Affected
Apache Software Foundation
Search vendor "Apache Software Foundation"
Apache Tomcat
Search vendor "Apache Software Foundation" for product "Apache Tomcat"
>= 10.1.0-M1 <= 10.1.24
Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 10.1.0-M1 <= 10.1.24"
en
Affected
Apache Software Foundation
Search vendor "Apache Software Foundation"
Apache Tomcat
Search vendor "Apache Software Foundation" for product "Apache Tomcat"
>= 9.0.0-M1 <= 9.0.89
Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 9.0.0-M1 <= 9.0.89"
en
Affected