CVE-2021-45100 (GCVE-0-2021-45100)

Vulnerability from cvelistv5 – Published: 2021-12-16 04:37 – Updated: 2024-08-04 04:32
VLAI
Summary
The ksmbd server through 3.4.2, as used in the Linux kernel through 5.15.8, sometimes communicates in cleartext even though encryption has been enabled. This occurs because it sets the SMB2_GLOBAL_CAP_ENCRYPTION flag when using the SMB 3.1.1 protocol, which is a violation of the SMB protocol specification. When Windows 10 detects this protocol violation, it disables encryption.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20220107-0001/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:01:49+00:00",
      "cve": "CVE-2021-45100",
      "id": "CVE-2021-45100",
      "initial_release_date": "2021-12-14T00:00:00+00:00",
      "product_status:known_not_affected": "196",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd server communicates in cleartext even though encryption has been enabled due to a violation of the SMB protocol specification",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-45100.json",
      "version": "3"
    }
  }
}



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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.