CVE-2018-16871

7.5 HIGH 3% exploit odds No fix listed

What it is

A flaw was found in the Linux kernel's NFS implementation, all versions 3.x and all versions 4.x up to 4.20. An attacker, who is able to mount an exported NFS filesystem, is able to trigger a null pointer dereference by using an invalid NFS sequence. This can panic the machine and deny access to the NFS server. Any outstanding disk writes to the NFS server will be lost.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 2.7% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2019-07-30 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 01:44 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.7% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2019-07-30 17:15 UTC
Last modified: 2026-06-17 01:44 UTC
Exploit probability: 2.7% · EPSS, next 30 days
Weakness: CWE-476 · NULL pointer dereference
Record status: Modified

Affected

Linux Kernel ≤ 4.20
Redhat Developer Tools 1.0
Redhat Mrg Realtime 2.0
Redhat Enterprise Linux 7.0
Redhat Enterprise Linux Desktop 7.0
Redhat Enterprise Linux Eus 7.4
Redhat Enterprise Linux Server 7.0
Redhat Enterprise Linux Server Aus 7.4

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

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References

NVD record · CVE.org record