CVE-2025-21521

Summary

CVE-2025-21521 is a vulnerability affecting Oracle MySQL Server's thread pooling component, specifically versions 8.0.39 and prior, 8.4.2 and prior, and 9.0.1 and prior. An unauthenticated attacker with network access can exploit this easily exploitable issue via multiple protocols, leading to a denial-of-service (DoS) condition. The potential consequences include server crashes or hangs, resulting in significant availability impacts, with a base CVSS score of 7.5.

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