Multiple unspecified vulnerabilities in multiple FITELnet products, including FITELnet-F40, F80, F100, F120, F1000, and E20/E30, allow remote attackers to cause a denial of service via crafted DNS messages that trigger errors in (1) ProxyDNS or (2) PKI-Resolver, as demonstrated by the OUSPG PROTOS DNS test suite.