Nlnetlabs: >> Nsd Security Vulnerabilities
NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
CVSS Score
8.7
EPSS Score
0.003
Published
2026-06-25
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.
CVSS Score
7.2
EPSS Score
0.003
Published
2026-06-25
When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.
CVSS Score
8.2
EPSS Score
0.001
Published
2026-06-25
If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes
CVSS Score
8.7
EPSS Score
0.003
Published
2026-06-25
Cache Poisoning issue exists in DNS Response Rate Limiting.
CVSS Score
5.9
EPSS Score
0.035
Published
2019-11-05
NSD before 4.1.11 allows remote DNS master servers to cause a denial of service (/tmp disk consumption and slave server crash) via a zone transfer with unlimited data.
CVSS Score
7.5
EPSS Score
0.029
Published
2017-02-09
query.c in NSD 3.0.x through 3.0.8, 3.1.x through 3.1.1, and 3.2.x before 3.2.12 allows remote attackers to cause a denial of service (NULL pointer dereference and child process crash) via a crafted DNS packet.
CVSS Score
5.0
EPSS Score
0.092
Published
2012-07-27
Off-by-one error in the packet_read_query_section function in packet.c in nsd 3.2.1, and process_query_section in query.c in nsd 2.3.7, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors that trigger a buffer overflow.
CVSS Score
5.0
EPSS Score
0.032
Published
2009-05-22