CVE-2021-45100

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-45100
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-45100.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-45100
Downstream
Related
Published
2021-12-16T05:15:08Z
Modified
2025-07-01T13:08:48.525815Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

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 SMB2GLOBALCAP_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.

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.15-1

Ecosystem specific 

{
    "urgency": "unimportant"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.15-1

Ecosystem specific 

{
    "urgency": "unimportant"
}

Git / github.com/cifsd-team/ksmbd

Affected ranges

Type
GIT
Repo
https://github.com/cifsd-team/ksmbd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
39d5ae81a07bc0caa81d2064d3653f54fd8da3b1

Affected versions

3.*

3.0.1
3.0.2
3.1.0
3.1.1
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.4.0
3.4.1
3.4.2

v2.*

v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6

v3.*

v3.0.0