What is CVE-2021-45100?

CVE-2021-45100 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10. CVE-2021-45100 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-45100?

CVE-2021-45100 has a CVSS score of 7.5 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Is there a patch available for CVE-2021-45100?

No patch is currently available for CVE-2021-45100. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-45100 actively exploited?

CVE-2021-45100 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-45100

High

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.

Package Linux Kernel

Published 2021-12-16

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.5

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness type

CWE-319

CVE-2021-45100 is classified as CWE-319

See CWE-319 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-45100 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

GitHub
https://github.com/cifsd-team/ksmbd/issues/550

Third Party Advisory
Marc
https://marc.info/?l=linux-kernel&m=163961726017023&w=2

Third Party Advisory
Security
https://security.netapp.com/advisory/ntap-20220107-0001/

Third Party Advisory
Kernel patch commit
https://github.com/cifsd-team/ksmbd/pull/551
Patch

Details

CVE ID CVE-2021-45100

Severity High

CVSS score 7.5 / 10

CVSS version 3.1

Published 2021-12-16

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-45100?

CVE-2021-45100 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10 . CVE-2021-45100 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-45100?

CVE-2021-45100 has a CVSS score of 7.5 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Is there a patch available for CVE-2021-45100?

No patch is currently available for CVE-2021-45100. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-45100 actively exploited?

No — CVE-2021-45100 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.