CVE-2020-17527

Description

While investigating bug 64830 it was discovered that Apache Tomcat 9.0.0 through 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.

How to fix CVE-2020-17527

To remediate CVE-2020-17527, upgrade the affected package to a fixed version below.

• —upgrade to 8.5.60 or later
• —upgrade to 8.5.54-0+deb9u5 or later
• —upgrade to 9.0.40-1 or later
• —upgrade to 10.0.0-M10 or later

Is CVE-2020-17527 being exploited?

Moderate — EPSS is 24.6%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (4)

• >= 8.5.1, < 8.5.60, >= 9.0.1, < 9.0.40
• from 0, < 8.5.54-0+deb9u5
• from 0, < 9.0.40-1
• >= 10.0.0-M1, < 10.0.0-M10

CVSS scores

References (50)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-17527
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-17527
• PATCHgithub.com/apache/tomcat
• WEBwww.openwall.com/lists/oss-security/2020/12/03/3
• WEB