Cisco IOS XE vulnerabilities

CVE-2023-20027 [HIGH] CWE-416 CVE-2023-20027: A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel

CVE-2023-20033 [HIGH] CWE-770 CVE-2023-20033: A vulnerability in Cisco IOS XE Software for Cisco Catalyst 3650 and Catalyst 3850 Series Switches c A vulnerability in Cisco IOS XE Software for Cisco Catalyst 3650 and Catalyst 3850 Series Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when processing traffic that is received on th

CVE-2026-20268 [HIGH] CWE-119 CVE-2026-20268: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE So As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20268 are related t

CVE-2025-20172 [HIGH] CWE-248 CVE-2025-20172: A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted S

CVE-2022-20851 [HIGH] CWE-77 CVE-2022-20851: A vulnerability in the web UI feature of Cisco IOS XE Software could allow an authenticated, remote A vulnerability in the web UI feature of Cisco IOS XE Software could allow an authenticated, remote attacker to perform an injection attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web UI API. A successful exploit could allow the a

CVE-2020-3509 [HIGH] CWE-388 CVE-2020-3509: A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broad A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause the supervisor to crash, which could result in a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are par

CVE-2021-1622 [HIGH] CWE-833 CVE-2021-1622: A vulnerability in the Common Open Policy Service (COPS) of Cisco IOS XE Software for Cisco cBR-8 Co A vulnerability in the Common Open Policy Service (COPS) of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause resource exhaustion, resulting in a denial of service (DoS) condition. This vulnerability is due to a deadlock condition in the code when processing COPS packets under cert

CVE-2025-20171 [HIGH] CWE-248 CVE-2025-20171: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20170 [HIGH] CWE-805 CVE-2025-20170: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20169 [HIGH] CWE-805 CVE-2025-20169: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20174 [HIGH] CWE-805 CVE-2025-20174: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20176 [HIGH] CWE-248 CVE-2025-20176: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20173 [HIGH] CWE-248 CVE-2025-20173: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2025-20175 [HIGH] CWE-805 CVE-2025-20175: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affect

CVE-2023-20065 [HIGH] CWE-284 CVE-2023-20065: A vulnerability in the Cisco IOx application hosting subsystem of Cisco IOS XE Software could allow A vulnerability in the Cisco IOx application hosting subsystem of Cisco IOS XE Software could allow an authenticated, local attacker to elevate privileges to root on an affected device. This vulnerability is due to insufficient restrictions on the hosted application. An attacker could exploit this vulnerability by logging in to and then escaping the Ci

CVE-2022-20697 [HIGH] CWE-691 CVE-2022-20697: A vulnerability in the web services interface of Cisco IOS Software and Cisco IOS XE Software could A vulnerability in the web services interface of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper resource management in the HTTP server code. An attacker could exploit this vulnerability by sending a large number of HTTP reques

CVE-2018-0177 [HIGH] CWE-19 CVE-2018-0177: A vulnerability in the IP Version 4 (IPv4) processing code of Cisco IOS XE Software running on Cisco 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 to a denial of service (DoS) condition. The vulnerability

CVE-2012-0384 [HIGH] CWE-269 CVE-2012-0384: Cisco IOS 12.2 through 12.4 and 15.0 through 15.2 and IOS XE 2.1.x through 2.6.x and 3.1.xS before 3 Cisco IOS 12.2 through 12.4 and 15.0 through 15.2 and IOS XE 2.1.x through 2.6.x and 3.1.xS before 3.1.2S, 3.2.xS through 3.4.xS before 3.4.2S, 3.5.xS before 3.5.1S, and 3.1.xSG and 3.2.xSG before 3.2.2SG, when AAA authorization is enabled, allow remote authenticated users to bypass intended access restrictions and execute commands via a (1) HTTP or (2)

CVE-2019-1950 [HIGH] CWE-255 CVE-2019-1950: A vulnerability in Cisco IOS XE SD-WAN Software could allow an unauthenticated, local attacker to ga A vulnerability in Cisco IOS XE SD-WAN Software could allow an unauthenticated, local attacker to gain unauthorized access to an affected device. The vulnerability is due to the existence of default credentials within the default configuration of an affected device. An attacker who has access to an affected device could log in with elevated privileges.

CVE-2017-3859 [HIGH] CWE-134 CVE-2017-3859: A vulnerability in the DHCP code for the Zero Touch Provisioning feature of Cisco ASR 920 Series Agg A vulnerability in the DHCP code for the Zero Touch Provisioning feature of Cisco ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a format string vulnerability when processing a crafted DHCP packet for Zero Touch Provisioning. An attacker could