CVE-2025-21605

Summary

CVE-2025-21605 is a vulnerability affecting Redis versions 2.6 to 7.4.2. An unauthenticated client can exploit this issue by causing unlimited growth of output buffers in the server. This leads to the service becoming unresponsive and exhausting memory. By default, Redis does not limit the output buffer for normal clients, allowing it to grow indefinitely. This issue is mitigated by upgrading to Redis version 7.4.3. An alternative workaround is to block unauthenticated access to Redis using network access control tools or enabling TLS with client-side certificates for authentication.

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