Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.3%
exploitation probability
0.3%top 80% of all CVEs
observed exploitation
nono source reports it
Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
net-snmp · Net-SNMPReferences
https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9ebhttps://github.com/net-snmp/net-snmphttps://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.chttps://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read