CVE-2021-38199

Name: CVE-2021-38199
Creator: NVD / NIST
Published: 2021-08-08T20:15:07.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.24%

Last modified Jun 17, 2026

CVE-2021-38199 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.. EPSS estimates a 1.24% chance of exploitation in the next 30 days.

Description

fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.24%

65.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.13.4
Netapp	Hci Bootstrap Os	All versions
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Element Software	All versions
Debian	Debian Linux	9.0
Debian	Debian Linux	11.0

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/dd99e9f98fbf423ff6d365b37a98e8879170f17cPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0010/Third Party Advisory
https://www.debian.org/security/2021/dsa-4978Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/dd99e9f98fbf423ff6d365b37a98e8879170f17cPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0010/Third Party Advisory
https://www.debian.org/security/2021/dsa-4978Third Party Advisory

Timeline

Published: Aug 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38199?

How severe is CVE-2021-38199?

CVE-2021-38199 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.24% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38199?

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-2021-38199?

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

Scan your code now

Source: NVD / NIST