CVE-2020-11996

Description

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

How to fix CVE-2020-11996

To remediate CVE-2020-11996, upgrade the affected package to a fixed version below.

• —upgrade to 8.5.56 or later
• —upgrade to 8.5.54-0+deb9u2 or later
• —upgrade to 9.0.36-1 or later
• —upgrade to 9.0.31-1~deb10u2 or later
• —upgrade to 10.0.0-M5 or later
• —upgrade to 10.0.0-M5 or later

Is CVE-2020-11996 being exploited?

Moderate — EPSS is 45.1%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (6)

• >= 8.5.0, < 8.5.56, >= 9.0.0, < 9.0.36
• from 0, < 8.5.54-0+deb9u2
• from 0, < 9.0.36-1
• from 0, < 9.0.31-1~deb10u2
• >= 10.0.0-M1, < 10.0.0-M5
• >= 10.0.0-M1, < 10.0.0-M5

CVSS scores

References (50)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-11996
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-11996
• PATCHgithub.com/apache/tomcat
• WEBlists.opensuse.org/opensuse-security-announce/2020-07/msg00064.html