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CVE-2021-43980

3.7 · LOW

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 i…

Published Sep 28, 2022CWE-362EPSS 2.36%

Overview

CVE-2021-43980 is a low-severity vulnerability. It was published on September 28, 2022 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2022/09/28/1Reflists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Reflists.debian.org/debian-lts-announce/2022/10/msg00029.htmlRefwww.debian.org/security/2022/dsa-5265Refwww.openwall.com/lists/oss-security/2022/09/28/1Reflists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Reflists.debian.org/debian-lts-announce/2022/10/msg00029.htmlRefwww.debian.org/security/2022/dsa-5265

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43980?

CVE-2021-43980 is a low-severity vulnerability. It was published on September 28, 2022 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2021-43980?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43980?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43980?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43980 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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