CVE-2021-33879
Last modified
CVE-2021-33879 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 1.02% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tencent | Gameloop | < 4.1.21.90 |
References
- https://github.com/mmiszczyk/cve-2021-33879Exploit, Third Party Advisory
- https://www.gameloop.comVendor Advisory
- https://github.com/mmiszczyk/cve-2021-33879Exploit, Third Party Advisory
- https://www.gameloop.comVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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