Cisco 2025: Critical SNMP Vulnerability Actively Exploited in IOS and IOS XE
In September 2025, Cisco disclosed that an actively exploited vulnerability (CVE-2025-20352, CVSS 7.7) in its IOS and IOS XE software allows remote attackers to execute arbitrary code or trigger a denial-of-service (DoS) condition via specially crafted SNMP packets. The flaw, which came to light after attacker activity was observed leveraging previously compromised administrative credentials, impacts a broad range of Cisco networking equipment. The immediate impact includes risks of device takeover, network disruption, and possible lateral movement within victims’ environments. This incident underscores the criticality of securing network infrastructure against both external and internal threats, as attackers continue to exploit overlooked or unpatched vulnerabilities at the core of modern networks. The active exploitation highlights an urgent need for organizations to review segmentation, monitoring, and patch management practices in light of evolving attack techniques.
Kill Chain