DoS Vulnerability in Cisco IOS Software and Cisco IOS XE Software SNMP Subsystem

CVE-2025-20170

What is CVE-2025-20170?

A flaw in the SNMP subsystem of Cisco IOS and IOS XE Software can allow an authenticated remote attacker to trigger a Denial of Service condition. This occurs due to improper error handling during the parsing of SNMP requests. An attacker capable of sending a specially crafted SNMP request to an affected device may induce an unexpected reload of the system, rendering it inoperative. Exploitation via SNMP v2c or earlier requires knowledge of a valid SNMP community string, while exploitation through SNMP v3 necessitates valid SNMP user credentials.

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