Description
ZyXEL Prestige 642R allows remote attackers to cause a denial of service in the Telnet, FTP, and DHCP services (crash) via a TCP packet with both the SYN and ACK flags set.
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.
Exploit-DB 1
- ZYXEL Prestige 642R Router - Malformed Packet Denial of Service EDB-21561 · dos · Jul 17, 2002 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 20020617 Re: ZyXEL 642R(-11) AJ.6 SYN-ACK, SYN-FIN DoS -- 643R testing mailing-list
- zyxel-tcp-packet-dos(9372) vdb-entry
- 5034 vdb-entry
- 20020617 ZyXEL 642R(-11) AJ.6 SYN-ACK, SYN-FIN DoS mailing-list
- 20020617 Follow: ZyXEL 642R-11 AJ.6 service DoS -- additional informations mailing-list