As many as 2 million Cisco devices are susceptible to an actively exploited zero-day that can remotely crash or execute code on vulnerable systems.
Cisco said Wednesday that the vulnerability, tracked as CVE-2025-20352, was present in all supported versions of Cisco IOS and Cisco IOS XE, the operating system that powers a wide variety of the company’s networking devices. The vulnerability can be exploited by low-privileged users to create a denial-of-service attack or by higher-privileged users to execute code that runs with unfettered root privileges. It carries a severity rating of 7.7 out of a possible 10.
Exposing SNMP to the Internet? Yep
“The Cisco Product Security Incident Response Team (PSIRT) became aware of successful exploitation of this vulnerability in the wild after local Administrator credentials were compromised,” Wednesday’s advisory stated. “Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability.”