Product · Cisco

IOS

39 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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High 8.6

CVE-2026-20301

Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability

A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition …

Cisco Cisco IOS XE Software IOS iOS Network devices

Aug 5, 2026
High 7.7

CVE-2026-20125

A vulnerability in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE Software Release 3E could allow an au…

Cisco Cisco IOS XE Software IOS iOS Network devices

Mar 25, 2026
High 8.6

CVE-2026-20012

A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Ci…

Cisco Cisco IOS XE Software Cisco Secure Firewall Threat Defense (FTD) Software Cisco Secure Firewall Adaptive Security Appliance (ASA) Software iOS Network devices

Mar 25, 2026
High 7.7

CVE-2025-20327

A vulnerability in the web UI of Cisco IOS Software could allow an authenticated, remote attacker with low privileges t…

Cisco IOS iOS Network devices

Sep 24, 2025
High 7.7

CVE-2025-20352 Exploited Public exploit EPSS 41%

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Softw…

Cisco Cisco IOS XE Software IOS Cisco IOS XE Catalyst SD-WAN iOS Network devices

Sep 24, 2025
KEV Sep 29, 2025
High 8.1

CVE-2025-20160

A vulnerability in the implementation of the TACACS+ protocol in Cisco IOS Software and Cisco IOS XE Software could all…

Cisco Cisco IOS XE Software IOS iOS Network devices

Sep 24, 2025
High 8.6

CVE-2025-20239

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure F…

Cisco Cisco IOS XE Software Cisco Firepower Threat Defense Software Cisco Adaptive Security Appliance (ASA) Software iOS Network devices

Aug 14, 2025
High 8.3

CVE-2025-20164

A vulnerability in the Cisco Industrial Ethernet Switch Device Manager (DM) of Cisco IOS Software could allow an authen…

Cisco IOS iOS Network devices

May 7, 2025
High 7.7

CVE-2025-20169

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20175

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20174

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20170

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20171

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20176

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20172

A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could all…

Cisco Cisco IOS XE Software Cisco IOS XR Software IOS iOS Network devices

Feb 5, 2025
High 7.7

CVE-2025-20173

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, rem…

Cisco Cisco IOS XE Software IOS iOS Network devices

Feb 5, 2025
High 8.6

CVE-2024-20433

A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software cou…

Cisco Cisco IOS XE Software IOS iOS Network devices

Sep 25, 2024
High 8.6

CVE-2024-20308

A vulnerability in the IKEv1 fragmentation code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthen…

Cisco Cisco IOS XE Software IOS iOS Network devices

Mar 27, 2024
High 7.4

CVE-2024-20312

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS Software and Cisco IOS …

Cisco Cisco IOS XE Software IOS iOS Network devices

Mar 27, 2024
High 7.4

CVE-2024-20276

A vulnerability in Cisco IOS Software for Cisco Catalyst 6000 Series Switches could allow an unauthenticated, adjacent …

Cisco IOS iOS Network devices

Mar 27, 2024
High 8.6

CVE-2024-20311

A vulnerability in the Locator ID Separation Protocol (LISP) feature of Cisco IOS Software and Cisco IOS XE Software co…

Cisco Cisco IOS XE Software IOS iOS Network devices

Mar 27, 2024
High 8.0

CVE-2023-20186

A vulnerability in the Authentication, Authorization, and Accounting (AAA) feature of Cisco IOS Software and Cisco IOS …

Cisco Cisco IOS XE Software IOS iOS Network devices

Sep 27, 2023
High 8.8

CVE-2017-6740 Exploited EPSS 11%

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilit…

Cisco IntelliShield IOS Universal Product iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022
High 8.8

CVE-2017-6743 Exploited EPSS 11%

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilit…

Cisco IntelliShield IOS Universal Product iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022
High 8.8

CVE-2017-6744 Exploited

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilit…

Cisco IntelliShield IOS Universal Product iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022
High 8.8

CVE-2017-6737 Exploited EPSS 45%

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the af…

Cisco IOS iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022
High 8.8

CVE-2017-6738 Exploited EPSS 11%

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilit…

Cisco Cisco IOS XE Software IOS iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022
High 8.8

CVE-2017-6736 Exploited Public exploit EPSS 70%

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilit…

Cisco IntelliShield IOS Universal Product iOS Network devices

Jul 17, 2017
KEV Mar 3, 2022