CVE-2010-2020 — sys/nfsclient/nfs_vfsops.c in the NFS client in the kernel in FreeBSD 7.2 through 8.1-PRERELEASE, when vfs.usermount is enabled, does not validate the length of a certain fhsize parameter, which allows local users to gain privileges via a crafted mount request

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MEDIUM

sys/nfsclient/nfs_vfsops.c in the NFS client in the kernel in FreeBSD 7.2 through 8.1-PRERELEASE, when vfs.usermount is enabled, does not validate the length of a certain fhsize parameter, which allows local users to gain privileges via a crafted mount request

Published May 28, 2010

6.9

MEDIUM

CVSS 2.0

EPSS 0.87%

Description

sys/nfsclient/nfs_vfsops.c in the NFS client in the kernel in FreeBSD 7.2 through 8.1-PRERELEASE, when vfs.usermount is enabled, does not validate the length of a certain fhsize parameter, which allows local users to gain privileges via a crafted mount request.

Affected products

Remediation

No remediation recorded yet.

Metrics

0.87% 0.00867

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00867

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.87% (0.00867)	57.21th	v5 (v2026.06.15)
Jun 15, 2026	0.87% (0.00867)	53.82th	v5 (v2026.06.15)
Mar 17, 2025	0.48% (0.00480)	63.03th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00042)	0.34th	v3 (v2023.03.01)
Jan 19, 2024	0.04% (0.00042)	0.44th	v3 (v2023.03.01)
Mar 7, 2023	0.05% (0.00050)	16.55th	v3 (v2023.03.01)
Mar 6, 2023	1.76% (0.01761)	76.53th	v2 (v2022.01.01)
Feb 23, 2023	1.76% (0.01761)	76.48th	v2 (v2022.01.01)
Apr 1, 2022	1.76% (0.01761)	74.44th	v2 (v2022.01.01)
Feb 4, 2022	1.76% (0.01761)	53.69th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (4)

http://security.FreeBSD.org/advisories/FreeBSD-SA-10:06.nfsclient.asc
vendor-advisoryx_refsource_FREEBSDVendor Advisory
http://securitytracker.com/id?1024039
vdb-entryx_refsource_SECTRACK
http://www.exploit-db.com/exploits/14002
exploitx_refsource_EXPLOIT-DB
http://www.exploit-db.com/exploits/14003
exploitx_refsource_EXPLOIT-DB

Link	Providers	Tags
http://security.FreeBSD.org/advisories/FreeBSD-SA-10:06.nfsclient.asc		vendor-advisoryx_refsource_FREEBSDVendor Advisory
http://securitytracker.com/id?1024039		vdb-entryx_refsource_SECTRACK
http://www.exploit-db.com/exploits/14002		exploitx_refsource_EXPLOIT-DB
http://www.exploit-db.com/exploits/14003		exploitx_refsource_EXPLOIT-DB