Cz.Nic Knot Resolver vulnerabilities
4 vulnerabilities
Known vulnerabilities in Cz.Nic Knot Resolver, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.
CVE-2018-10920cz.nicknot-resolver+3
EPSS score3.24%
Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.CVE-2019-19331cz.nicknot-resolver+4EPSS score2.11%
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).CVE-2019-10190cz.nicknot-resolver+4EPSS score1.99%
A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.CVE-2019-10191cz.nicknot-resolver+4EPSS score1.93%
A vulnerability was discovered in DNS resolver of knot resolver before version 4.1.0 which allows remote attackers to downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.