CVE-2021-4157

Name: CVE-2021-4157
Creator: NVD / NIST
Published: 2022-03-25T19:15:09.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 1.60%

Last modified Jun 17, 2026

CVE-2021-4157 is a high-severity vulnerability rated 8/10 on the CVSS scale. 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.. EPSS estimates a 1.60% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

1.60%

72.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 4.0, < 4.4.269
Linux	Linux Kernel	>= 4.5, < 4.9.269
Linux	Linux Kernel	>= 4.10, < 4.14.233
Linux	Linux Kernel	>= 4.15, < 4.19.191
Linux	Linux Kernel	>= 4.20, < 5.4.120
Linux	Linux Kernel	>= 5.5, < 5.10.38
Linux	Linux Kernel	>= 5.11, < 5.11.22
Linux	Linux Kernel	>= 5.12, < 5.12.5
Fedoraproject	Fedora	35
Netapp	H300e Firmware	All versions
Netapp	H300s Firmware	All versions
Netapp	H500e Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700e Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H410s Firmware	All versions
Oracle	Communications Cloud Native Core Binding Support Function	22.1.1
Oracle	Communications Cloud Native Core Binding Support Function	22.1.3
Oracle	Communications Cloud Native Core Binding Support Function	22.2.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=2034342Issue Tracking, Third Party Advisory
https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
https://security.netapp.com/advisory/ntap-20220602-0007/Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2034342Issue Tracking, Third Party Advisory
https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
https://security.netapp.com/advisory/ntap-20220602-0007/Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory

Timeline

Published: Mar 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4157?

How severe is CVE-2021-4157?

CVE-2021-4157 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4157?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4157?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST