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
debian/tomcat9
9.0.43-2~deb11u10
9.0.43-2~deb11u11
9.0.70-2
9.0.95-1
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

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

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

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.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203