CVE WatchOct 8, 2026

CVE-2021-41079

Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was co

CVSS

7.5

High

EPSS

7.2%

p94

KEV

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Exploit Today

0-100

Published: Sep 16, 2021 · Last modified: Oct 8, 2026 · CWE-20 · CWE-835

EPSS · 30d

7.2%EPSS · 30 days7.2%

2026-10-032026-10-30

Technical description

Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-1201947.5 HIG

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