What’s Vulnerable › Vulnerabilities

CVE-2023-32251: Kernel: ksmbd brute force delay bypass via asynchronous requests

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-31 · updated 2026-06-30
• Weakness: CWE-307

Description

A vulnerability has been identified in the Linux kernel's ksmbd component (kernel SMB/CIFS server). A security control designed to prevent dictionary attacks, which introduces a 5-second delay during session setup, can be bypassed through the use of asynchronous requests. This bypass negates the intended anti-brute-force protection, potentially allowing attackers to conduct dictionary attacks more efficiently against user credentials or other authentication mechanisms.

References

• https://access.redhat.com/security/cve/CVE-2023-32251
• https://bugzilla.redhat.com/show_bug.cgi?id=2385852
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b096d97f47326b1e2dbdef1c91fab69ffda54d17
• https://www.zerodayinitiative.com/advisories/ZDI-23-699/

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