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CVE-2021-42340

7.5 · HIGH

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak.

Published Oct 14, 2021CWE-772EPSS 11.80%

Overview

CVE-2021-42340 is a high-severity vulnerability. It was published on October 14, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.

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

Refkc.mcafee.com/corporate/index?page=content&id=SB10379Reflists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3EReflists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3ERefsecurity.gentoo.org/glsa/202208-34Refsecurity.netapp.com/advisory/ntap-20211104-0001/Refwww.debian.org/security/2021/dsa-5009Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefwww.oracle.com/security-alerts/cpujan2022.htmlRefwww.oracle.com/security-alerts/cpujul2022.htmlRefkc.mcafee.com/corporate/index?page=content&id=SB10379

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42340?

CVE-2021-42340 is a high-severity vulnerability. It was published on October 14, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-42340?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-42340?

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-2021-42340?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42340 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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