CVE-2021-41079

Description

Apache Tomcat 8.5.0 to 8.5.63, 9.0.0 to 9.0.43 and 10.0.0 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.

How to fix CVE-2021-41079

To remediate CVE-2021-41079, upgrade the affected package to a fixed version below.

• —upgrade to 8.5.64 or later
• —upgrade to 8.5.54-0+deb9u8 or later
• —upgrade to 9.0.43-2~deb11u2 or later
• —upgrade to 9.0.31-1~deb10u6 or later
• —upgrade to 10.0.4 or later

Is CVE-2021-41079 being exploited?

Moderate — EPSS is 6.7%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (5)

• >= 8.5.0, < 8.5.64, >= 9.0.0, < 9.0.44, >= 10.0.0, < 10.0.3
• from 0, < 8.5.54-0+deb9u8
• from 0, < 9.0.43-2~deb11u2
• from 0, < 9.0.31-1~deb10u6
• >= 10.0.0, < 10.0.4

CVSS scores

References (13)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-41079
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-41079
• PATCHgithub.com/apache/tomcat
• WEBgithub.com/apache/tomcat/commit/34115fb3c83f6cd97772232316a492a4cc5729e0