3.7
LOW
CVE-2023-32251
Linux Kernel ksmbd Dictionary Attack Bypass
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.

INFO

Published Date :

July 31, 2025, 9:15 p.m.

Last Modified :

Aug. 1, 2025, 1:15 a.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

2.2
Affected Products

The following products are affected by CVE-2023-32251 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-32251.

URL Resource
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b096d97f47326b1e2dbdef1c91fab69ffda54d17
https://www.zerodayinitiative.com/advisories/ZDI-23-699/

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-32251 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-32251 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    Aug. 01, 2025

    Action Type Old Value New Value
    Removed Reference https://access.redhat.com/security/cve/CVE-2023-32251
    Removed Reference https://bugzilla.redhat.com/show_bug.cgi?id=2385852
  • New CVE Received by [email protected]

    Jul. 31, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
    Added CWE CWE-307
    Added Reference https://access.redhat.com/security/cve/CVE-2023-32251
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2385852
    Added Reference https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b096d97f47326b1e2dbdef1c91fab69ffda54d17
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-23-699/
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-32251 is associated with the following CWEs:

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability