7.5High
Apache Tomcat
CVE-2020-13934
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.
What this means for your business
- It affects Apache Tomcat. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 64% chance of attack attempts being seen in the next 30 days, ranking above 99% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Apache Tomcat, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
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Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-401
- Assigned by
- security@apache.org
Dates
- Published
- 2020-07-14
- Last modified
- 2026-08-25
- Sources
- NVD
Affected products
- Apache Tomcat8.5.1 - 8.5.56, 9.0.1 - 9.0.36, 9.0.0, 10.0.0
- Debian Debian Linux9.0, 10.0
- Netapp Oncommand System Manager3.0.0 - 3.1.3
- Opensuse Leap15.1, 15.2
- Canonical Ubuntu Linux20.04
- Oracle Agile Engineering Data Management6.2.1.0
- Oracle Agile Product Lifecycle Management9.3.3, 9.3.5, 9.3.6
- Oracle Communications Instant Messaging Server10.0.1.5.0
- Oracle Fmw Platform12.2.1.3.0, 12.2.1.4.0
- Oracle Instantis Enterprisetrack17.1, 17.2, 17.3
- Oracle Managed File Transfer12.2.1.3.0, 12.2.1.4.0
- Oracle Mysql Enterprise Monitor- 8.0.21
As listed in the NVD configuration data. Not a statement about your estate.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
- https://security.netapp.com/advisory/ntap-20200724-0003/
- https://usn.ubuntu.com/4596-1/
- https://www.debian.org/security/2020/dsa-4727
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html