Cisco vulnerabilities
We track 810 vulnerabilities in Cisco products across 60+ products. 790 are rated high or critical, and 106 have been exploited in real attacks. The most recent was published on November 4, 2026.
Latest Cisco vulnerabilities
- 7.5 High severity
Cisco Small Business RV320 and RV325 Routers Information Disclosure Exploited
A vulnerability in the web-based management interface of Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers could allow an unauthenticated, remote attacker to retrieve sensitive information. The vulnerability is due to improper access controls f
- 7.2 High severity
Cisco Small Business Routers Improper Input Validation Exploited
A vulnerability in the web-based management interface of Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers could allow an authenticated, remote attacker with administrative privileges on an affected device to execute arbitrary commands. The vul
- 7.5 High severity
Cisco Adaptive Security Appliance (ASA) Denial-of-Service Exploited
A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. It is also possible on cer
- 5.9 Medium severity
Cisco IOS Software Denial-of-Service Exploited
Multiple vulnerabilities in the Login Enhancements (Login Block) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to trigger a reload of an affected system, resulting in a denial of service (DoS) condition. These vulnerabilities af
- 5.9 Medium severity
Cisco IOS Software Denial-of-Service Exploited
Multiple vulnerabilities in the Login Enhancements (Login Block) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to trigger a reload of an affected system, resulting in a denial of service (DoS) condition. These vulnerabilities af
- 8.0 High severity
Cisco IOS, XR, and XE Software Buffer Overflow Exploited
Format String vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute
- 8.6 High severity
Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Exploited
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulne
- 8.6 High severity
Cisco IOS and IOS XE Software Improper Input Validation Exploited
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in
- 8.6 High severity
Cisco IOS and IOS XE Software Improper Input Validation Exploited
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulne
- 9.8 Critical severity
Cisco IOS and IOS XE Software Smart Install Remote Code Execution Exploited
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition, or to execute arbitrary co
- 8.8 High severity
Cisco IOS, XR, and XE Software Buffer Overflow Exploited
Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) conditio
- 6.3 Medium severity
Cisco IOS Software Resource Management Errors Exploited
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition, aka a GET MIB Obje
- 7.5 High severity
Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Exploited
A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of servi
- 8.6 High severity
Cisco IOS and XE Software Internet Key Exchange Memory Leak Exploited
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak or a reload of an affected device that leads to a denial of service (Do
- 7.5 High severity
Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Exploited
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due t
- 8.6 High severity
Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Exploited
A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causin
- 7.5 High severity
Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Exploited
A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is d
- 9.8 Critical severity
Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Exploited
A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges. The vulne
- 5.9 Medium severity
Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Exploited
A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or p
- 9.8 Critical severity
Cisco Secure Access Control System Java Deserialization Exploited
A vulnerability in Java deserialization used by Cisco Secure Access Control System (ACS) prior to release 5.8 patch 9 could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected device. The vulnerability is due to insecure dese
- 9.8 Critical severity
Cisco VPN Routers Remote Code Execution Exploited
A vulnerability in the web interface of the Cisco RV132W ADSL2+ Wireless-N VPN and RV134W VDSL2 Wireless-AC VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system, including issuing com
- 9.8 Critical severity
Cisco IOS and IOS XE Software DHCP Remote Code Execution Exploited
The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system. The attacker could also cause
- 6.5 Medium severity
Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Exploited
A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS 15.0 through 15.4 for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resultin
- 7.5 High severity
Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Exploited
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS 15.0 through 15.6 and Cisco IOS XE 3.5 through 16.5 could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected
- 7.5 High severity
Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Exploited
A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS 12.2 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) co
- 7.5 High severity
Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Exploited
Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) conditio
- 7.5 High severity
Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Exploited
Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) conditio
- 6.5 Medium severity
Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Exploited
A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a d
- 7.5 High severity
Cisco IOS Software Network Address Translation Denial-of-Service Exploited
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due
- 8.1 High severity
Apache Struts Deserialization of Untrusted Data Exploited
The REST Plugin in Apache Struts 2.1.1 through 2.3.x before 2.3.34 and 2.5.x before 2.5.13 uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to Remote Code Execution when deserializing XML payload
- 7.5 High severity
Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Exploited
A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a
- 6.5 Medium severity
Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Exploited
A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. Mo
- 8.8 High severity
Cisco IOS Software SNMP Remote Code Execution Exploited
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected devi
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected devi
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected devi
- 8.8 High severity
Cisco IOS and IOS XE Software SNMP Remote Code Execution Exploited
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.