Description
The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient.conf directives. When the lease file is subsequently re-parsed by dhclient, e.g., after a system restart, an attacker-controlled field from the lease is passed to dhclient-script(8), which evaluates it. A rogue DHCP server may be able to execute arbirary code as root on a system running dhclient.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://security.freebsd.org/advisories/FreeBSD-SA-26:12.dhclient.asc
Scores
CVSS v3
8.1
EPSS
0.0003
EPSS Percentile
10.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-149
Status
published
Products (8)
freebsd/freebsd
13.5 (14 CPE variants)
freebsd/freebsd
14.3 (12 CPE variants)
freebsd/freebsd
14.4 (4 CPE variants)
freebsd/freebsd
15.0 (7 CPE variants)
FreeBSD/FreeBSD
13.5-RELEASE - p13
FreeBSD/FreeBSD
14.3-RELEASE - p12
FreeBSD/FreeBSD
14.4-RELEASE - p3
FreeBSD/FreeBSD
15.0-RELEASE - p7
Published
Apr 30, 2026
Tracked Since
Apr 30, 2026