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CVE-2021-45100

7.5 · 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.

Published Dec 16, 2021CWE-319EPSS 0.91%

Overview

CVE-2021-45100 is a high-severity vulnerability. It was published on December 16, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cifsd-team/ksmbd/issues/550GitHubgithub.com/cifsd-team/ksmbd/pull/551Refmarc.info/?l=linux-kernel&m=163961726017023&w=2Refsecurity.netapp.com/advisory/ntap-20220107-0001/GitHubgithub.com/cifsd-team/ksmbd/issues/550GitHubgithub.com/cifsd-team/ksmbd/pull/551Refmarc.info/?l=linux-kernel&m=163961726017023&w=2Refsecurity.netapp.com/advisory/ntap-20220107-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-45100?

CVE-2021-45100 is a high-severity vulnerability. It was published on December 16, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-45100?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-45100?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-45100?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-45100 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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