CVE-2018-17159

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-04 · updated 2026-06-17
Weakness: CWE-400

Description

In FreeBSD before 11.2-STABLE(r340854) and 11.2-RELEASE-p5, the NFS server lacks a bounds check in the READDIRPLUS NFS request. Unprivileged remote users with access to the NFS server can cause a resource exhaustion by forcing the server to allocate an arbitrarily large memory allocation.

Affected products

FreeBSD: before 11.2; 11.2-p5 — fixed in 11.2

How to fix

Upgrade to a fixed version: FreeBSD 11.2. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/106192
http://www.securitytracker.com/id/1042164
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-24/
https://security.freebsd.org/advisories/FreeBSD-SA-18:13.nfs.asc
http://www.securityfocus.com/bid/106192
http://www.securitytracker.com/id/1042164
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-24/
https://security.freebsd.org/advisories/FreeBSD-SA-18:13.nfs.asc

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