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CVE-2020-36406

8.8 · HIGH

uWebSockets 18.11.0 and 18.12.0 has a stack-based buffer overflow in uWS::TopicTree::trimTree (called from uWS::TopicTree::unsubscribeAll).

Published Jul 1, 2021CWE-787EPSS 1.52%

Overview

CVE-2020-36406 is a high-severity vulnerability. It was published on July 1, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

uWebSockets 18.11.0 and 18.12.0 has a stack-based buffer overflow in uWS::TopicTree::trimTree (called from uWS::TopicTree::unsubscribeAll). NOTE: the vendor's position is that this is "a minor issue or not even an issue at all" because the developer of an application (that uses uWebSockets) should not be allowing the large number of triggered topics to accumulate

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

Refbugs.chromium.org/p/oss-fuzz/issues/detail?id=25381GitHubgithub.com/google/oss-fuzz-vulns/blob/main/vulns/uwebsockets/OSV-2020-1695.yamlGitHubgithub.com/uNetworking/uWebSockets/commit/03fca626a95130ab80f86adada54b29d27242759Refbugs.chromium.org/p/oss-fuzz/issues/detail?id=25381GitHubgithub.com/google/oss-fuzz-vulns/blob/main/vulns/uwebsockets/OSV-2020-1695.yamlGitHubgithub.com/uNetworking/uWebSockets/commit/03fca626a95130ab80f86adada54b29d27242759

How CyberStrike helps

Frequently asked questions

What is CVE-2020-36406?

CVE-2020-36406 is a high-severity vulnerability. It was published on July 1, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-36406?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2020-36406?

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-2020-36406?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-36406 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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