![]() The FTP service in QNAP iArtist Lite before 1.4.54, as distributed with QNAP Signage Station before 2.0.1, has hardcoded credentials, which makes it easier for remote attackers to obtain access via a session on TCP port 21. An attacker could exploit this vulnerability using TCP port 21 to gain administrative access to the device. TURCK BL20 / BL67 could allow a remote attacker to bypass security restrictions, caused by the use of hardcoded credentials for the FTP service. ()įTP proxy server for Novell BorderManager 3.6 SP 1a allows remote attackers to cause a denial of service (network connectivity loss) via a connection to port 21 with a large amount of random data. Also opens a backdoor on a random tcp port and/or port 80/udp. It exploits the MS Plug and Play Buffer Overflow vulnerability (MS Security Bulletin ) on port 21/tcp., and by sending copies of itself to gathered email addresses. ![]() Trojan horses/backdoors that also use this port: 7tp trojan, MBT, Back Construction, Blade Runner, Cattivik FTP Server, CC Invader, Dark FTP, Doly Trojan, Fore, Invisible FTP, Juggernaut 42, Larva, MotIv FTP, Nerte 7.8.1, Net Administrator, Ramen, Senna Spy FTP server, The Flu, Traitor 21, WebEx, WinCrash,, , - a mass-mailing worm that opens a backdoor and lowers security settings on the compromised computer. File Transfer Protocol - some network devices may be listening on this port, such as NAT routers for remote access/private cloud storage and network attached multi-function printers (scan to ftp feature).Īsus RT routers may open an internet accessible FTP server for USB-attached storage, configurable in administration panel under "USB Application > Servers Center > FTP Share" ![]()
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