VULNERABILITY INTELLIGENCE

CVE-2021-45100

CVSS score7.5 HIGH
EPSS probability0.91%
CISA KEVNot currently listed
Published2021-12-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

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.

Weakness classification

  • nvd@nist.gov: CWE-319

Primary references