CVE-2023-32251 (GCVE-0-2023-32251)

Vulnerability from cvelistv5 – Published: 2025-07-31 20:44 – Updated: 2026-06-30 06:36
VLAI
Title
Kernel: ksmbd brute force delay bypass via asynchronous requests
Summary
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.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-01 13:29 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version CPE status
Affected: 0 , < 5.15.145 (semvar)
Affected: 6.0.0 , < 6.0.* (semvar)
Affected: 6.1.0 , < 6.1.29 (semvar)
Affected: 6.2.0 , < 6.2.16 (semvar)
Affected: 6.3.0 , < 6.3.2 (semvar)
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Date Public
2023-05-17 00:00
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              "value": "A vulnerability has been identified in the Linux kernel\u0027s 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."
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            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
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                  "description": "Improper Restriction of Excessive Authentication Attempts",
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            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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              "url": "https://access.redhat.com/security/cve/CVE-2023-32251"
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              "name": "RHBZ#2385852",
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              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2385852"
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              "url": "https://www.zerodayinitiative.com/advisories/ZDI-23-699/"
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          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2025-07-31T19:56:30.351Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2023-05-17T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Kernel: ksmbd brute force delay bypass via asynchronous requests",
          "x_generator": {
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          },
          "x_redhatCweChain": "CWE-307: Improper Restriction of Excessive Authentication Attempts"
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        "assignerShortName": "redhat",
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        "datePublished": "2025-07-31T20:44:02.968Z",
        "dateReserved": "2023-05-05T10:00:07.895Z",
        "dateUpdated": "2026-06-30T06:36:58.944Z",
        "state": "PUBLISHED"
      },
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    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.