Security Advisories, Responses and Notices
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- Cisco IOS Software and IOS XE Software Release 3E HTTP Server Denial of Service Vulnerability 25/Mar/2026New
- Cisco IOS, IOS XE, Secure Firewall Adaptive Security Appliance, and Secure Firewall Threat Defense Software IKEv2 Denial of Service Vulnerability 25/Mar/2026New
- Cisco IOS XE Software Secure Copy Protocol Server Denial of Service Vulnerability 25/Mar/2026New
- Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, IOS Software, IOS XE Software, and IOS XR Software Web Services Remote Code Execution Vulnerability 06/Nov/2025
- Cisco IOS XE Software Network-Based Application Recognition Denial of Service Vulnerability 24/Sep/2025
- Cisco IOS XE Software CLI Argument Injection Vulnerability 24/Sep/2025
- Cisco IOS and IOS XE Software CLI Denial of Service Vulnerability 24/Sep/2025
- Cisco IOS, IOS XE, Secure Firewall Adaptive Security Appliance, and Secure Firewall Threat Defense Software IKEv2 Denial of Service Vulnerabilities 14/Aug/2025
- SNMP Remote Code Execution Vulnerabilities in Cisco IOS and IOS XE Software 30/Jul/2025
- Cisco IOS XE Software Privilege Escalation Vulnerabilities 07/May/2025
- Cisco Adaptive Security Appliance Software, Firepower Threat Defense Software, IOS Software, and IOS XE Software IKEv2 Denial of Service Vulnerability 07/May/2025
- Cisco IOS, IOS XE, and IOS XR Software TWAMP Denial of Service Vulnerability 07/May/2025
- Cisco IOS XE Software Internet Key Exchange Version 1 Denial of Service Vulnerability 07/May/2025
- Cisco IOS and IOS XE Software SNMPv3 Configuration Restriction Vulnerability 07/May/2025
- Cisco IOS, IOS XE, and IOS XR Software SNMP Denial of Service Vulnerabilities 12/Mar/2025
- Cisco IOS and IOS XE Software Web UI Cross-Site Request Forgery Vulnerability 25/Sep/2024
- Cisco IOS XE Software HTTP Server Telephony Services Denial of Service Vulnerability 25/Sep/2024
- Cisco IOS and IOS XE Software Resource Reservation Protocol Denial of Service Vulnerability 25/Sep/2024
- Cisco IOS and IOS XE Software Internet Key Exchange Version 1 Fragmentation Denial of Service Vulnerabilities 27/Mar/2024
- Cisco IOS and IOS XE Software Locator ID Separation Protocol Denial of Service Vulnerability 27/Mar/2024
- Cisco IOS XE Software Auxiliary Asynchronous Port Denial of Service Vulnerability 27/Mar/2024
- Cisco IOS and IOS XE Software Intermediate System-to-Intermediate System Denial of Service Vulnerability 27/Mar/2024
- Cisco IOS and IOS XE Software Command Authorization Bypass Vulnerability 13/Oct/2023
- Cisco IOS XE Software for ASR 1000 Series Aggregation Services Routers IPv6 Multicast Denial of Service Vulnerability 27/Sep/2023
- Cisco IOS and IOS XE Software Cisco Group Encrypted Transport VPN Software Out-of-Bounds Write Vulnerability 27/Sep/2023
- Cisco IOS XE Software Virtual Fragmentation Reassembly Denial of Service Vulnerability 23/Mar/2023
- Cisco IOS and IOS XE Software IPv6 DHCP (DHCPv6) Relay and Server Denial of Service Vulnerability 22/Mar/2023
- Cisco IOS and Cisco IOS XE Software UDP Packet Processing Denial of Service Vulnerability 17/Dec/2022
- Cisco IOS and IOS XE Software Internet Key Exchange Denial of Service Vulnerability 17/Dec/2022
- Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial of Service Vulnerability 16/Dec/2022
- Cisco IOS and IOS XE Software DHCP Version 4 Relay Heap Overflow Denial of Service Vulnerability 15/Dec/2022
- Cisco IOS, IOS XE, and IOS XR Software Link Layer Discovery Protocol Buffer Overflow Vulnerabilities 15/Dec/2022
- Cisco IOS and IOS XE Software DHCP Version 4 Relay Reply Denial of Service Vulnerability 15/Dec/2022
- Cisco IOS and IOS XE Software SSH Denial of Service Vulnerability 28/Sep/2022
- Cisco IOS XE Software AppNav-XE Denial of Service Vulnerability 13/Apr/2022
- Cisco IOS XE Software Border Gateway Protocol Resource Public Key Infrastructure Denial of Service Vulnerability 13/Apr/2022
- Cisco IOS XE Software H.323 Application Level Gateway Bypass Vulnerability 22/Sep/2021
- Cisco IOS XE Software Rate Limiting Network Address Translation Denial of Service Vulnerability 22/Sep/2021
- Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers Common Open Policy Service Denial of Service Vulnerability 22/Sep/2021
- Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability 22/Sep/2021
- Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability 22/Sep/2021
- Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability 22/Sep/2021
- Cisco ASR 900 and ASR 920 Series Aggregation Services Routers Access Control List Bypass Vulnerability 22/Sep/2021
- Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers Simple Network Management Protocol Denial of Service Vulnerability 22/Sep/2021
- Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability 22/Sep/2021
- Cisco IOS XE Software Arbitrary Code Execution Vulnerability 24/Mar/2021
- Cisco IOS XE Software Plug-and-Play Privilege Escalation Vulnerability 24/Mar/2021
- Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability 24/Mar/2021
- Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers DHCP Denial of Service Vulnerability 24/Sep/2020
- Cisco IOS XE Software Arbitrary Code Execution Vulnerability 24/Sep/2020
- Cisco IOS and IOS XE Software Information Disclosure Vulnerability 24/Sep/2020
- Cisco IOS XE Software Common Open Policy Service Engine Denial of Service Vulnerability 24/Sep/2020
- Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability 24/Sep/2020
- Telnet Vulnerability Affecting Cisco Products: June 2020 08/Jul/2020
- Cisco IOS and IOS XE Software Tcl Denial of Service Vulnerability 08/Jun/2020
- Cisco IOS XE Software Privilege Escalation Vulnerability 03/Jun/2020
- Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability 03/Jun/2020
- Cisco IOS, IOS XE, IOS XR, and NX-OS Software One Platform Kit Remote Code Execution Vulnerability 03/Jun/2020
- Cisco IOS and IOS XE Software Secure Shell Denial of Service Vulnerability 03/Jun/2020
- Cisco IOS XE Software Privilege Escalation Vulnerability 03/Jun/2020
- Cisco IOS and IOS XE Software Internet Key Exchange Version 2 Denial of Service Vulnerability 03/Jun/2020
- Cisco IOS and IOS XE Software Session Initiation Protocol Denial of Service Vulnerability 03/Jun/2020
- Cisco IOS and IOS XE Software Tcl Arbitrary Code Execution Vulnerability 03/Jun/2020
- Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability 03/Jun/2020
- Cisco IOS and Cisco IOS XE Software Web UI Cross-Site Request Forgery Vulnerability 28/Apr/2020
- Cisco REST API Container for IOS XE Software Authentication Bypass Vulnerability 18/Oct/2019
- Cisco IOS and IOS XE Software Session Initiation Protocol Denial of Service Vulnerability 04/Oct/2019
- Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway Denial of Service Vulnerability 25/Sep/2019
- Cisco IOS XE Software Arbitrary Code Execution Vulnerability 25/Sep/2019
- Cisco NX-OS and IOS XE Software Virtual Service Image Signature Bypass Vulnerability 25/Sep/2019
- Cisco IOS and IOS XE Software Change of Authorization Denial of Service Vulnerability 25/Sep/2019
- Cisco IOS and IOS XE Software HTTP Client Information Disclosure Vulnerability 25/Sep/2019
- Cisco IOS and IOS XE Software IP Ident Denial of Service Vulnerability 25/Sep/2019
- Cisco Products IPv6 Neighbor Discovery Crafted Packet Denial of Service Vulnerability 16/Sep/2019
- Cisco IOS and IOS XE Software Hot Standby Router Protocol Information Leak Vulnerability 01/Apr/2019
- Cisco IOS XE Software Command Injection Vulnerability 27/Mar/2019
- Cisco IOS and IOS XE Software IP Service Level Agreement Denial of Service Vulnerability 27/Mar/2019
- Cisco IOS and IOS XE Software Network Plug-and-Play Agent Certificate Validation Vulnerability 27/Mar/2019
- Cisco IOS and IOS XE Software ISDN Interface Denial of Service Vulnerability 27/Mar/2019
- Cisco IOS and IOS XE Software TCP Denial of Service Vulnerability 09/Jan/2019
- Cisco IOS XE Software and Cisco ASA 5500-X Series Adaptive Security Appliance IPsec Denial of Service Vulnerability 28/Sep/2018
- Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software TACACS+ Client Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software Cisco Discovery Protocol Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software IPv6 Hop-by-Hop Options Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software OSPFv3 Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS XE Software Privileged EXEC Mode Root Shell Access Vulnerability 26/Sep/2018
- Cisco IOS XE Software Command Injection Vulnerabilities 26/Sep/2018
- Cisco IOS and IOS XE Software SM-1T3/E3 Service Module Denial of Service Vulnerability 26/Sep/2018
- Cisco IOS and IOS XE Software Quality of Service Remote Code Execution Vulnerability 27/Apr/2018
- Cisco IOS XE Software User EXEC Mode Root Shell Access Vulnerabilities 28/Mar/2018
- Cisco IOS XE Software Simple Network Management Protocol Double-Free Denial of Service Vulnerability 28/Mar/2018
- Cisco IOS and IOS XE Software EnergyWise Denial of Service Vulnerabilities 22/Mar/2018
- Multiple Vulnerabilities in Cisco IOS XE Software for Cisco ASR 1000 Series, Cisco ISR 4400 Series, and Cisco Cloud Services 1000v Series Routers 23/Feb/2018
- Cisco IOS XE Software for Cisco ASR 1000 Series and cBR-8 Routers Line Card Console Access Vulnerability 27/Sep/2017
- Cisco IOS and IOS XE Software Plug-and-Play PKI API Certificate Validation Vulnerability 27/Sep/2017
- Multiple Cisco Products OSPF LSA Manipulation Vulnerability 03/Aug/2017
- Cisco IOS and IOS XE Software Autonomic Control Plane Channel Information Disclosure Vulnerability 26/Jul/2017
- Cisco IOS and IOS XE Software Autonomic Networking Infrastructure Denial of Service Vulnerability 26/Jul/2017
- Cisco IOS XE Software Startup Script Local Command Execution Vulnerability 05/Apr/2017
- Cisco IOS XE Software Web User Interface Denial of Service Vulnerability 22/Mar/2017
- Cisco IOS XE Software for Cisco ASR 920 Series Routers Zero Touch Provisioning Denial of Service Vulnerability 22/Mar/2017
- Cisco IOS and IOS XE Software Layer 2 Tunneling Protocol Denial of Service Vulnerability 22/Mar/2017
- Cisco IOS and IOS XE Software Autonomic Networking Infrastructure Registrar Denial of Service Vulnerability 20/Mar/2017
- Cisco IOS and IOS XE Software IPv6 Denial of Service Vulnerability 20/Mar/2017
- Cisco ASR 1000 Series Aggregation Services Routers SNMP High CPU Denial of Service Vulnerability 01/Feb/2017
- Cisco IOS Software and IOS XE Software Internet Key Exchange Version 2 Denial of Service Vulnerabilities 07/Dec/2016
- IKEv1 Information Disclosure Vulnerability in Multiple Cisco Products 05/Oct/2016
- Cisco IOS XE Software IP Fragment Reassembly Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS XE Software NAT Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software Internet Key Exchange Version 1 Fragmentation Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software AAA Login Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software IP Detail Record Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software H.323 Message Validation Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software DNS Forwarder Denial of Service Vulnerability 28/Sep/2016
- Cisco IOS and IOS XE Software Multicast Routing Denial of Service Vulnerabilities 28/Sep/2016
- Cisco IOS and IOS XE Software Border Gateway Protocol Message Processing Denial of Service Vulnerability 15/Jul/2016
- Cisco IOS XE Software SNMP Subsystem Denial of Service Vulnerability 20/Jun/2016
- Cisco cBR-8 Series Converged Broadband Router SNMP Denial of Service Vulnerability 17/Jun/2016
- Multiple Cisco Products libSRTP Denial of Service Vulnerability 10/May/2016
- Cisco IOS and IOS XE and Cisco Unified Communications Manager Software Session Initiation Protocol Memory Leak Vulnerability 09/May/2016
- Cisco IOS and Cisco IOS XE ntp Subsystem Unauthorized Access Vulnerability 19/Apr/2016
- Cisco IOS and IOS XE Software Internet Key Exchange Version 2 Fragmentation Denial of Service Vulnerability 23/Mar/2016
- Cisco IOS and IOS XE Software DHCPv6 Relay Denial of Service Vulnerability 23/Mar/2016
- Cisco IOS Software and IOS XE Software TCP Packet Memory Leak Vulnerability 14/Jan/2016
- Multiple Vulnerabilities in Cisco IOS Software and IOS XE Software Autonomic Networking Infrastructure 14/Jan/2016
- Cisco IOS and IOS XE Software IKEv1 State Machine Denial of Service Vulnerability 18/Dec/2015
- Cisco IOS XE Software IPv6 Neighbor Discovery Denial of Service Vulnerability 14/Dec/2015
- Multiple Vulnerabilities in ntpd (April 2015) Affecting Cisco Products 07/Dec/2015
- Cisco IOS XE 3S Platforms Series root Shell License Bypass Vulnerability 03/Dec/2015
- OpenSSL RSA Temporary Key Cryptographic Downgrade Vulnerability 08/Oct/2015
- Cisco IOS Software and Cisco IOS XE Software Crafted DHCPv6 Sequence Denial of Service Vulnerability 08/Oct/2015
- Cisco IOS-XE Fragmented Packet Resource Consumption Vulnerability 08/Oct/2015
- Cisco IOS XE Software Autonomic Networking Infrastructure Overwrite Vulnerability 02/Oct/2015
- Cisco IOS Software and IOS XE Software NTP Access Group Vulnerability 02/Oct/2015
- Cisco IOS XE Software Autonomic Networking Infrastructure Certificate Chain Validation Vulnerability 02/Oct/2015
- Cisco IOS XE Software Autonomic Networking Infrastructure Certificate Validation Vulnerability 02/Oct/2015
- Cisco IOS XE Software Autonomic Networking Infrastructure Routing Protocol for Low-Power and Lossy Networks Vulnerability 02/Oct/2015
- Cisco IOS and IOS XE Software SSH Version 2 RSA-Based User Authentication Bypass Vulnerability 23/Sep/2015
- Cisco IOS XE Software Network Address Translation Denial of Service Vulnerability 23/Sep/2015
- Cisco IOS Software and IOS XE Software mDNS Gateway Denial of Service Vulnerability 25/Mar/2015
- Multiple Vulnerabilities in OpenSSL (January 2015) Affecting Cisco Products 10/Mar/2015
- GNU Bash Environment Variable Command Injection Vulnerability 26/Sep/2014
- Cisco IOS Software DHCP Version 6 Denial of Service Vulnerability 24/Sep/2014
- Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability 24/Sep/2014
- Multiple Vulnerabilities in Cisco IOS Software Multicast Domain Name System 24/Sep/2014
- Cisco IOS Software and Cisco IOS XE Software EnergyWise Crafted Packet Denial of Service Vulnerability 20/Aug/2014