CVE-2014-7912

Description

The get_option function in dhcp.c in dhcpcd before 6.2.0, as used in dhcpcd 5.x in Android before 5.1 and other products, does not validate the relationship between length fields and the amount of data, which allows remote DHCP servers to execute arbitrary code or cause a denial of service (memory corruption) via a large length value of an option in a DHCPACK message.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 12	dhcpcd5	6.9.1-1	—
Debian 7	dhcpcd5	5.5.6-1+deb7u2	DLA-506-1

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu Pro 14.04 LTS	dhcpcd5	No fix yet	—

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

vaginessa/cve-2014-7912 ★ 0 · Nov 22, 2017

exp for cve-2014-7911 which can get system privillage

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

DLA-506-1 dhcpcd5 - security update Debian Security (DSA / DLA) · Mar 9, 2026

The get_option function in dhcp.c in dhcpcd before 6.2.0, as used in dhcpcd 5.x in Android before 5.1 and other products, does not validate…