Description
ISC DHCP 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1 allows remote attackers to cause a denial of service (server exit) via a zero-length client ID.
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 13 | isc-dhcp | 4.1.1-P1-1 | — |
| Debian 12 | isc-dhcp | 4.1.1-P1-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dhcp | 4.3.3.P1-3.1 | openSUSE-SU-2024:10358-1 |
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.
Metasploit 1 module
-
ISC DHCP Zero Length ClientID Denial of Service Module
auxiliary/dos/dhcp/isc_dhcpd_clientid
Exploit-DB 1
- ISC DHCPD - Denial of Service EDB-14185 · dos · Jul 3, 2010
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- openSUSE-SU-2024:10358-1 dhcp-4.3.3.P1-3.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- MDVSA-2010:114 vendor-advisory
- 40116 third-party-advisory
- http://ftp.isc.org/isc/dhcp/dhcp-4.1.1-P1-RELNOTES
- FEDORA-2010-9433 vendor-advisory
- 40775 vdb-entry
- 14185 exploit
- dhcp-zero-length-dos(59222) vdb-entry
- http://ftp.isc.org/isc/dhcp/dhcp-4.0.2-P1-RELNOTES
- 1024093 vdb-entry