CVE-2021-43980

The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

• CWE-362
• CWE-362

• http://www.openwall.com/lists/oss-security/2022/09/28/1Mailing List, Third Party Advisory
• https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Mailing List, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/10/msg00029.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5265Third Party Advisory
• http://www.openwall.com/lists/oss-security/2022/09/28/1Mailing List, Third Party Advisory
• https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Mailing List, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/10/msg00029.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5265Third Party Advisory

Published

Sep 28, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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