CVE-2021-38199 Denial of service in n/a

What is CVE-2021-38199?

CVE-2021-38199 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 8 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2021-38199?

It affects 6 products.

Products include Debian Debian Linux, Linux kernel, Netapp Element Software, Netapp Hci Bootstrap Os, Netapp Hci Management Node, Netapp Solidfire.

How do I fix CVE-2021-38199?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-38199 being exploited?

There is no known exploitation of CVE-2021-38199 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6583, DEBIAN-CVE-2021-38199, GHSA-2crj-6275-fwfr, UBUNTU-CVE-2021-38199.