CVE-2020-13934
Published:July 14, 2020
Updated:September 01, 2026
An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
Affected Packages
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=9.0.0.M6 <9.0.36Fix Suggestion:
Update to version 9.0.36org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=8.5.2 <8.5.56Fix Suggestion:
Update to version 8.5.56org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=10.0.0-M1 <10.0.0-M6Fix Suggestion:
Update to version 10.0.0-M6Related Resources (19)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
64.12