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Advisories

Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read

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severity
high
date
Affecting

  • Net-SNMP <= 5.9.5.2

CWE
  • CWE-1088: Synchronous Access of Remote Resource without Timeout
  • CWE-400: Uncontrolled Resource Consumption
CVSS
8.7
CVSS V4 Vector
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
Credit
Ali Firas
Description
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.

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