Cisco IOS Software Login Enhancements Login Block Denial of Service Vulnerabilities

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. For more information about these vulnerabilities, see the Details...

Cisco IOS and IOS XE Software Internet Key Exchange Version 1 Denial of Service Vulnerability

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 service DoS condition. The vulnerability is...

Cisco IOS Software 802.1x Multiple-Authentication Port Authentication Bypass Vulnerability

A vulnerability in the 802.1x multiple-authentication multi-auth feature of Cisco IOS Software could allow an unauthenticated, adjacent attacker to bypass the authentication phase on an 802.1x multi-auth port. The vulnerability is due to a logic change error introduced into the code. An attacker...

Cisco IOS XE Software Internet Group Management Protocol Memory Leak Vulnerability

A vulnerability in the Internet Group Management Protocol IGMP packet-processing functionality of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust buffers on an affected device, resulting in a denial of service DoS condition. The vulnerability is due to the...

Cisco IOS XE Software Switch Integrated Security Features IPv6 Denial of Service Vulnerability

A vulnerability in the Switch Integrated Security Features of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an interface queue wedge. The vulnerability is due to incorrect handling of crafted IPv6 packets. An attacker could exploit this vulnerability by sending...

Cisco IOS and IOS XE Software Forwarding Information Base Denial of Service Vulnerability

A vulnerability in the Forwarding Information Base FIB code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker to cause a denial of service DoS condition. The vulnerability is due to a limitation in the way the FIB is internally representing recursive...

Cisco IOS XE Software with Cisco Umbrella Integration Denial of Service Vulnerability

A vulnerability in the Cisco Umbrella Integration feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service DoS condition. The vulnerability is due to a logic error that exists when handling a malformed incoming packet, leading to access to an...

Cisco IOS XE Software CLI Command Injection Vulnerabilities

Multiple vulnerabilities in the CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to inject arbitrary commands into the CLI of the affected software, which could allow the attacker to gain access to the underlying Linux shell of an affected device and execute comman...

Cisco IOS XE Software Arbitrary File Write Vulnerability

A vulnerability in the web-based user interface web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to write arbitrary files to the operating system of an affected device. The vulnerability is due to insufficient input validation of HTTP requests that are sent to the web...

Cisco IOS, IOS XE, and IOS XR Software Link Layer Discovery Protocol Buffer Overflow Vulnerabilities

Multiple 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 condition or execute arbitrary code with elevated privileges on a...

Cisco IOS XE Software for Cisco Catalyst Switches IPv4 Denial of Service Vulnerability

A vulnerability in the IP Version 4 IPv4 processing code of Cisco IOS XE Software running on Cisco Catalyst 3850 and Cisco Catalyst 3650 Series Switches could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads ...

Cisco IOS XE Software Privileged EXEC Mode Root Shell Access Vulnerability

A vulnerability in the CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to gain access to the underlying Linux shell of an affected device and execute arbitrary commands with root privileges on the device. The vulnerability is due to the affected software improperl...

Cisco IOS XE Software Zone-Based Firewall IP Fragmentation Denial of Service Vulnerability

A vulnerability in the Zone-Based Firewall code of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a device to reload. The vulnerability is due to the way fragmented packets are handled in the firewall code. An attacker could exploit this vulnerability by sending...

Cisco IOS XE Software Simple Network Management Protocol Double-Free Denial of Service Vulnerability

A vulnerability in Simple Network Management Protocol SNMP subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service DoS condition. The vulnerability is due to improper management of memory resources, referred to as a double free. An attacker...

Cisco IOS XE Software REST API Authorization Bypass Vulnerability

A vulnerability in the Cisco IOS XE Software REST API could allow an authenticated, remote attacker to bypass API authorization checks and use the API to perform privileged actions on an affected device. The vulnerability is due to insufficient authorization checks for requests that are sent to t...

Cisco IOS and IOS XE Software DHCP Version 4 Relay Denial of Service Vulnerability

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 vulnerability exists because the affected...

Cisco IOS XE Software User EXEC Mode Root Shell Access Vulnerabilities

Multiple vulnerabilities in the CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to gain access to the underlying Linux shell of an affected device and execute arbitrary commands with root privileges on the device. The vulnerabilities are due to the affected softwa...

Cisco IOS and IOS XE Software DHCP Version 4 Relay Heap Overflow Denial of Service Vulnerability

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 vulnerability exists because the affected...

Cisco IOS XE Software for Cisco 4000 Series Integrated Services Routers Privileged EXEC Mode Root Shell Access Vulnerability

A vulnerability in the CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to gain access to the underlying Linux shell of an affected device and execute arbitrary commands with root privileges on the device. The vulnerability is due to the affected software improperl...

Cisco IOS Software Simple Network Management Protocol GET MIB Object ID Denial of Service Vulnerability

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. The vulnerability is due to a condition that could occur wh...

Cisco IOS Software Integrated Services Module for VPN Denial of Service Vulnerability

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 due to insufficient handling of VPN traffi...

Cisco IOS and IOS XE Software Quality of Service Remote Code Execution Vulnerability

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 vulnerability is due to incorrect bounds...

Cisco IOS XE Software Web UI Cross-Site Scripting Vulnerabilities

Multiple vulnerabilities in the web-based user interface web UI of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web UI of the affected software. The vulnerabilities are due to insufficient input validation...

Cisco IOS and IOS XE Software DHCP Version 4 Relay Reply Denial of Service Vulnerability

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 a denial of service DoS condition. The...

Cisco IOS and IOS XE Software Bidirectional Forwarding Detection Denial of Service Vulnerability

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, causing a denial of service DoS condition. Th...

Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability

Update August 20, 2025: Cisco is aware of continued exploitation activity of the vulnerability that is described in this advisory and strongly recommends that customers assess their systems and upgrade to a fixed software release as soon as possible. A vulnerability in the Smart Install feature o...

Cisco Umbrella Dashboard Session Expiration Issue

Cisco Umbrella uses the internet infrastructure to block connections to malicious destinations before any connections to those destinations can be established. Cisco Umbrella also provides visibility into internet activity across all devices and all ports, even when users are no longer connected ...

Cisco Secure Access Control System Java Deserialization Vulnerability

A vulnerability in Java deserialization used by Cisco Secure Access Control System ACS could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected device. The vulnerability is due to insecure deserialization of user-supplied content by the affected software. An...

Cisco Secure Access Control Server XML External Entity Injection Vulnerability

A vulnerability in the web-based user interface of the Cisco Secure Access Control Server could allow an unauthenticated, remote attacker to gain read access to certain information in the affected system. The vulnerability is due to improper handling of XML External Entities XXEs when parsing an...

Cisco Data Center Network Manager Cross-Site Request Forgery Vulnerability

A vulnerability in the web-based management interface of Cisco Data Center Network Manager could allow an unauthenticated, remote attacker to conduct a cross-site request forgery CSRF attack and perform arbitrary actions on an affected device. The vulnerability is due to insufficient CSRF...

Cisco Identity Services Engine Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Identity Services Engine ISE could allow an unauthenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web-based management interface of an affected device. The vulnerability is due to...

Cisco Web Security Appliance FTP Authentication Bypass Vulnerability

A vulnerability in the FTP server of the Cisco Web Security Appliance WSA could allow an unauthenticated, remote attacker to log in to the FTP server of the device without a valid password. The attacker does need to have a valid username. The vulnerability is due to incorrect FTP user credential...

Cisco StarOS CLI Command Injection Vulnerability

A vulnerability in the CLI of the Cisco StarOS operating system for Cisco ASR 5000 Series Aggregation Services Routers could allow an authenticated, local attacker to perform a command injection attack on an affected system. The vulnerability is due to insufficient validation of commands that are...

Cisco Identity Services Engine Local Command Injection Vulnerability

A vulnerability in certain CLI commands of Cisco Identity Services Engine ISE could allow an authenticated, local attacker to execute arbitrary commands on the host operating system with the privileges of the local user. These commands should have been restricted from this user. The vulnerability...

Cisco Prime Collaboration Provisioning Hard-Coded Password Vulnerability

A vulnerability in Cisco Prime Collaboration Provisioning PCP Software could allow an unauthenticated, local attacker to log in to the underlying Linux operating system. The vulnerability is due to a hard-coded account password on the system. An attacker could exploit this vulnerability by...

Cisco Secure Access Control Server XML External Entity Injection Vulnerability

A vulnerability in the web-based user interface of the Cisco Secure Access Control Server could allow an unauthenticated, remote attacker to gain read access to certain information in the affected system. The vulnerability is due to improper handling of XML External Entities XXEs when parsing an...

Cisco Identity Services Engine Cross-Site Request Forgery Vulnerability

A vulnerability in the web-based management interface of Cisco Identity Services Engine ISE could allow an unauthenticated, remote attacker to conduct a cross-site request forgery CSRF attack and perform arbitrary actions on an affected device. The vulnerability is due to insufficient CSRF...

Cisco Registered Envelope Service Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of the Cisco Registered Envelope Service could allow an authenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web-based management interface of the affected service. The vulnerability is due to...

Cisco Identity Services Engine Command Injection to Underlying Operating System Vulnerability

A vulnerability in specific CLI commands for the Cisco Identity Services Engine ISE could allow an authenticated, local attacker to perform command injection to the underlying operating system or cause a hang or disconnect of the user session. The attacker needs valid administrator credentials fo...

Cisco UCS Director Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Unified Computing System UCS Director could allow an unauthenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web-based management interface of an affected device. The vulnerability is due to...

Cisco Identity Services Engine Authenticated Privilege Escalation Vulnerability

A vulnerability in the credential reset functionality for Cisco Identity Services Engine ISE could allow an authenticated, remote attacker to gain elevated privileges. The vulnerability is due to a lack of proper input validation. An attacker could exploit this vulnerability by authenticating to...

Cisco Security Manager DesktopServlet Reflected Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Security Manager could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting XSS attack against a user of the web-based interface. The vulnerability is due to insufficient validation of user-supplied...

Cisco Identity Services Engine Authenticated CLI Denial of Service Vulnerability

A vulnerability in specific CLI commands for the Cisco Identity Services Engine could allow an authenticated, local attacker to cause a denial of service DoS condition. The device may need to be manually rebooted to recover. The vulnerability is due to lack of proper input validation of the CLI...

Cisco Identity Services Engine Cross-Site Request Forgery Vulnerability

A vulnerability in the web-based management interface of Cisco Identity Services Engine ISE could allow an unauthenticated, remote attacker to conduct a cross-site request forgery CSRF attack and perform arbitrary actions on an affected device. The vulnerability is due to insufficient CSRF...

Cisco Videoscape AnyRes Live Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Videoscape AnyRes Live could allow an authenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web-based management interface of an affected device. The vulnerability is due to insufficient...

Cisco 550X Series Stackable Managed Switches SNMP Denial of Service Vulnerability

A vulnerability in the Simple Network Management Protocol SNMP subsystem communication channel through the Cisco 550X Series Stackable Managed Switches could allow an authenticated, remote attacker to cause the device to reload unexpectedly, causing a denial of service DoS condition. The device n...

Cisco Prime Data Center Network Manager Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Prime Data Center Network Manager could allow an unauthenticated, remote attacker to conduct a cross-site scripting XSS attack against a user of the web-based management interface of an affected device. The vulnerability is due to...

Cisco StarOS CLI Command Injection Vulnerability

A vulnerability in the CLI of the Cisco StarOS operating system for Cisco ASR 5000 Series Aggregation Services Routers could allow an authenticated, local attacker to execute arbitrary commands with root privileges on an affected operating system. The vulnerability is due to insufficient validati...

Cisco Unity Connection Mail Relay Vulnerability

A vulnerability in the SMTP relay of Cisco Unity Connection could allow an unauthenticated, remote attacker to send unsolicited email messages. The vulnerability is due to improper handling of domain information in the affected software. An unauthenticated, remote attacker could exploit this...

Cisco Prime Collaboration Provisioning Tool User Provisioning Tab Cross-Site Scripting Vulnerability

A vulnerability in the User Provisioning tab in the Cisco Prime Collaboration Provisioning Tool could allow an unauthenticated, remote attacker to conduct a cross-site scripting XSS attack. The vulnerability is due to improper input validation. An attacker could exploit this vulnerability by...