high
7.5
CWE
401 476 400
Advisory Published
Updated

CVE-2020-13934: Null Pointer Dereference

First published: Tue Jul 14 2020(Updated: )

A flaw was found in Apache Tomcat, where an h2c direct connection did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests are made, an OutOfMemoryException could occur, leading to a denial of service. The highest threat from this vulnerability is to system availability.

Credit: security@apache.org

Affected SoftwareAffected VersionHow to fix
redhat/jws5-tomcat<0:9.0.30-5.redhat_6.1.el6
0:9.0.30-5.redhat_6.1.el6
redhat/jws5-tomcat<0:9.0.30-5.redhat_6.1.el7
0:9.0.30-5.redhat_6.1.el7
redhat/jws5-tomcat<0:9.0.30-5.redhat_6.1.el8
0:9.0.30-5.redhat_6.1.el8
redhat/tomcat<10.0.0
10.0.0
redhat/tomcat<9.0.37
9.0.37
redhat/tomcat<8.5.57
8.5.57
IBM Engineering Requirements Management DOORS Web Access<=9.7.2.7
IBM Rational DOORS Web Access<=9.7.2.7
Tomcat>=8.5.1<=8.5.56
Tomcat>=9.0.1<=9.0.36
Tomcat=9.0.0-milestone10
Tomcat=9.0.0-milestone11
Tomcat=9.0.0-milestone12
Tomcat=9.0.0-milestone13
Tomcat=9.0.0-milestone14
Tomcat=9.0.0-milestone15
Tomcat=9.0.0-milestone16
Tomcat=9.0.0-milestone17
Tomcat=9.0.0-milestone18
Tomcat=9.0.0-milestone19
Tomcat=9.0.0-milestone20
Tomcat=9.0.0-milestone21
Tomcat=9.0.0-milestone22
Tomcat=9.0.0-milestone23
Tomcat=9.0.0-milestone24
Tomcat=9.0.0-milestone25
Tomcat=9.0.0-milestone26
Tomcat=9.0.0-milestone27
Tomcat=9.0.0-milestone5
Tomcat=9.0.0-milestone6
Tomcat=9.0.0-milestone7
Tomcat=9.0.0-milestone8
Tomcat=9.0.0-milestone9
Tomcat=10.0.0-milestone1
Tomcat=10.0.0-milestone2
Tomcat=10.0.0-milestone3
Tomcat=10.0.0-milestone4
Tomcat=10.0.0-milestone5
Tomcat=10.0.0-milestone6
Debian Linux=9.0
Debian Linux=10.0
NetApp System Manager>=3.0.0<=3.1.3
SUSE Linux=15.1
SUSE Linux=15.2
Ubuntu=20.04
Oracle Agile Engineering Data Management=6.2.1.0
Oracle Agile Product Lifecycle Management Framework=9.3.3
Oracle Agile Product Lifecycle Management Framework=9.3.5
Oracle Agile Product Lifecycle Management Framework=9.3.6
Oracle Communications Instant Messaging Server=10.0.1.5.0
Oracle Fusion Middleware Platform=12.2.1.3.0
Oracle Fusion Middleware Platform=12.2.1.4.0
Oracle Instantis EnterpriseTrack=17.1
Oracle Instantis EnterpriseTrack=17.2
Oracle Instantis EnterpriseTrack=17.3
Oracle Managed File Transfer=12.2.1.3.0
Oracle Managed File Transfer=12.2.1.4.0
MySQL Enterprise Monitor<=8.0.21
Oracle Siebel User Interface Framework<=20.12
Oracle Workload Manager=12.2.0.1
Oracle Workload Manager=18c
Oracle Workload Manager=19c
debian/tomcat9
9.0.43-2~deb11u10
9.0.43-2~deb11u12
9.0.70-2
9.0.95-1

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

Remedy

https://www.oracle.com/security-alerts/cpuApr2021.html

Remedy

https://www.oracle.com/security-alerts/cpujan2021.html

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

https://www.oracle.com/security-alerts/cpuoct2020.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-13934?

    CVE-2020-13934 has been classified as a medium severity vulnerability due to the potential for denial of service from an OutOfMemoryException.

  • How do I fix CVE-2020-13934?

    To mitigate CVE-2020-13934, upgrade to one of the fixed versions such as Apache Tomcat 8.5.57, 9.0.37, or 10.0.0.

  • Which versions of Apache Tomcat are affected by CVE-2020-13934?

    CVE-2020-13934 affects Apache Tomcat versions from 8.5.1 to 8.5.56, and from 9.0.1 to 9.0.36.

  • What causes the vulnerability CVE-2020-13934?

    CVE-2020-13934 is caused by an h2c direct connection not releasing the HTTP/1.1 processor after the upgrade to HTTP/2.

  • What impacts can CVE-2020-13934 have on my server?

    If exploited, CVE-2020-13934 can lead to an OutOfMemoryException, resulting in a denial of service on the affected server.

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