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CVE-2021-4157

8.0 · HIGH

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS).

Published Mar 25, 2022CWE-119EPSS 1.58%

Overview

CVE-2021-4157 is a high-severity vulnerability. It was published on March 25, 2022 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

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

Refbugzilla.redhat.com/show_bug.cgi?id=2034342Reflore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/Refsecurity.netapp.com/advisory/ntap-20220602-0007/Refwww.oracle.com/security-alerts/cpujul2022.htmlRefbugzilla.redhat.com/show_bug.cgi?id=2034342Reflore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/Refsecurity.netapp.com/advisory/ntap-20220602-0007/Refwww.oracle.com/security-alerts/cpujul2022.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4157?

CVE-2021-4157 is a high-severity vulnerability. It was published on March 25, 2022 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2021-4157?

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4157?

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-2021-4157?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4157 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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