Cisco Issues Urgent Fix for Critical IOS Zero-Day Exploits
TL;DR Summary
Cisco has issued a warning about a high-severity, actively exploited vulnerability in IOS and IOS XE Software (CVE-2025-20352) that affects SNMP protocols, allowing remote attackers with certain credentials to execute arbitrary code or cause a denial-of-service. The flaw, rooted in a stack overflow, has been patched in Cisco IOS XE Software Release 17.15.4a, but mitigation involves restricting SNMP access to trusted users and monitoring SNMP activity.
- Cisco Warns of Actively Exploited SNMP Vulnerability Allowing RCE or DoS in IOS Software The Hacker News
- Cisco warns of IOS zero-day vulnerability exploited in attacks BleepingComputer
- As many as 2 million Cisco devices affected by actively exploited 0-day Ars Technica
- Cisco fixes IOS/IOS XE zero-day exploited by attackers (CVE-2025-20352) Help Net Security
- Cisco Patches Zero-Day Flaw Affecting Routers and Switches SecurityWeek
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