Description
In FreeBSD 12.1-STABLE before r365010, 11.4-STABLE before r365011, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, dhclient(8) fails to handle certain malformed input related to handling of DHCP option 119 resulting a heap overflow. The heap overflow could in principle be exploited to achieve remote code execution. The affected process runs with reduced privileges in a Capsicum sandbox, limiting the immediate impact of an exploit.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | FreeBSD | FreeBSD 12.1-RELEASE before p9, 11.4-RELEASE before p3, 11.3-RELEASE before p13 | — |
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.
GitHub 2 repositories
-
knqyf263/CVE-2020-7461 ★ 15 · Apr 14, 2021
PoC for DHCP vulnerability (NAME:WRECK) in FreeBSD
-
0xkol/freebsd-dhclient-poc ★ 1 · Nov 30, 2022
Reproducer PoC for FreeBSD dhclient heap-based buffer overflow vulnerability when parsing DHCP option 119 (CVE-2020-7461)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- ICSA-21-257-11 Siemens SIMATIC RFID CISA ICS & IT advisories · May 6, 2025
- SSA-288459 SSA-288459: Heap Overflow Vulnerability in RFID terminals Siemens ProductCERT · Sep 14, 2021