CVE-2021-43980: Apache Tomcat Race Condition vulnerability

September 28, 2022 (updated November 10, 2022)

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.

References

www.openwall.com/lists/oss-security/2022/09/28/1
github.com/advisories/GHSA-jx7c-7mj5-9438
lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
nvd.nist.gov/vuln/detail/CVE-2021-43980

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