Vulnerability in Tencent Gameloop
CVE-2021-33879
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.gameloop.com (Vendor Advisory)
- github.com/mmiszczyk/cve-2021-33879 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33879?
- CVE-2021-33879 is a high-severity vulnerability in Tencent Gameloop, classified under Download of Code Without Integrity Check. CVSS score: 8.1/10. Published 2021-06-06.
- How severe is CVE-2021-33879?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-33879 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.