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GHSA-jx7c-7mj5-9438

Apache Tomcat Race Condition vulnerability

Source: GitHub Advisory Database (reviewed) Low CVE-2021-43980

Packages

EcosystemPackageAffectedFixed in
Maven org.apache.tomcat:tomcat >= 8.5.0, < 8.5.78 8.5.78
Maven org.apache.tomcat:tomcat >= 9.0.0-M1, < 9.0.62 9.0.62
Maven org.apache.tomcat:tomcat >= 10.0.0-M1, < 10.0.20 10.0.20
Maven org.apache.tomcat:tomcat >= 10.1.0-M1, < 10.1.0-M14 10.1.0-M14

Details

As written in the advisory (Markdown source, shown as plain text).

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

External links from the advisory. They lead to third-party sites.