Cisco IOS

18 known vulnerabilities in Cisco IOS, 18 actively exploited, with patch priority, exploit likelihood and the news covering them.

Recently exploited

  • CVE-2025-20352 CVSS 7.7 high · actively exploited Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
  • CVE-2023-20109 CVSS 6.6 medium · actively exploited Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
  • CVE-2018-0180 CVSS 5.9 medium · actively exploited Cisco IOS Software Denial-of-Service Vulnerability
  • CVE-2018-0179 CVSS 5.9 medium · actively exploited Cisco IOS Software Denial-of-Service Vulnerability
  • CVE-2018-0161 CVSS 6.3 medium · actively exploited Cisco IOS Software Resource Management Errors Vulnerability
  • CVE-2018-0154 CVSS 7.5 high · actively exploited Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability
  • CVE-2017-12238 CVSS 6.5 medium · actively exploited Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Vulnerability
  • CVE-2017-12235 CVSS 7.5 high · actively exploited Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability
  • CVE-2017-12234 CVSS 7.5 high · actively exploited Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability
  • CVE-2017-12233 CVSS 7.5 high · actively exploited Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability

Latest vulnerabilities

  • CVE-2025-20352 CVSS 7.7 high · actively exploited Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
  • CVE-2023-20109 CVSS 6.6 medium · actively exploited Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
  • CVE-2018-0180 CVSS 5.9 medium · actively exploited Cisco IOS Software Denial-of-Service Vulnerability
  • CVE-2018-0179 CVSS 5.9 medium · actively exploited Cisco IOS Software Denial-of-Service Vulnerability
  • CVE-2018-0161 CVSS 6.3 medium · actively exploited Cisco IOS Software Resource Management Errors Vulnerability
  • CVE-2018-0154 CVSS 7.5 high · actively exploited Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability
  • CVE-2017-12238 CVSS 6.5 medium · actively exploited Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Vulnerability
  • CVE-2017-12235 CVSS 7.5 high · actively exploited Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability
  • CVE-2017-12234 CVSS 7.5 high · actively exploited Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability
  • CVE-2017-12233 CVSS 7.5 high · actively exploited Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability
  • CVE-2017-12232 CVSS 6.5 medium · actively exploited Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability
  • CVE-2017-12231 CVSS 7.5 high · actively exploited Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability
  • CVE-2017-6744 CVSS 8.8 high · actively exploited Cisco IOS Software SNMP Remote Code Execution Vulnerability
  • CVE-2017-6743 CVSS 8.8 high · actively exploited Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
  • CVE-2017-6740 CVSS 8.8 high · actively exploited Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
  • CVE-2017-6738 CVSS 8.8 high · actively exploited Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
  • CVE-2017-6737 CVSS 8.8 high · actively exploited Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
  • CVE-2017-6736 CVSS 8.8 high · actively exploited Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability