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CVE-2021-33879

8.1 · HIGH

Tencent GameLoop before 4.1.21.90 downloaded updates over an insecure HTTP connection.

Published Jun 6, 2021CWE-494EPSS 1.20%

Overview

CVE-2021-33879 is a high-severity vulnerability. It was published on June 6, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Tencent GameLoop before 4.1.21.90 downloaded updates over an insecure HTTP connection. A malicious attacker in an MITM position could spoof the contents of an XML document describing an update package, replacing a download URL with one pointing to an arbitrary Windows executable. Because the only integrity check would be a comparison of the downloaded file's MD5 checksum to the one contained within the XML document, the downloaded executable would then be executed on the victim's machine.

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

GitHubgithub.com/mmiszczyk/cve-2021-33879Refwww.gameloop.comGitHubgithub.com/mmiszczyk/cve-2021-33879Refwww.gameloop.com

How CyberStrike helps

Frequently asked questions

What is CVE-2021-33879?

CVE-2021-33879 is a high-severity vulnerability. It was published on June 6, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-33879?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2021-33879?

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-2021-33879?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-33879 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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