Cisco has 555 CVEs on record between 2017 and 2026. Disclosure cadence is accelerating: 178 in the last 90 days against 27 in the 90 before. The busiest recent month was September 2026 with 96. The median CVSS is 7.4 (high), with 77 rated critical. 4% have been exploited in the wild, in line with the corpus average. When CISA adds a Cisco CVE to KEV it happens fast: a median of 6 days after publication (18 cases). The dominant weakness classes are CWE-20 (41) and CWE-400 (33). Most affected products: secure_firewall_threat_defense (75), identity_services_engine (33), Cisco IOS XE Software (23).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 4% vs 1% corpus
- Median CVSS
- 7.4
- Publish → KEV
- 6 d median(18)
- Last 90 days
- 178 prev 27
Weakness classes
Products
- secure_firewall_threat_defense 75
- identity_services_engine 33
- Cisco IOS XE Software 23
- Cisco Identity Services Engine Software 22
- IOS 22
- enterprise_nfv_infrastructure_software 21
Worst active — by depth score
CVE-2026-20079Critical· 10.0A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access …98CVE-2026-76460Critical· 10.0A vulnerability in an API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass authentication. This vulnerability is due to insufficient authentication control on an API endpoint95CVE-2026-20230High· 8.6A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forg…90CVE-2026-76504Critical· 9.8A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is …87CVE-2025-20393Critical· 10.0Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability86
cisco vulnerabilities
CVEs affecting cisco, newest first. Open any entry for full detail, references, and exploit status.
555 CVEsRSS
CVE-2025-20142High· 8.6Cisco IOS XR Software for ASR 9000 Series Routers L2VPN Denial of Service Vulnerability
A vulnerability in the IPv4 access control list (ACL) feature and quality of service (QoS) policy feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9…
CVE-2025-20143Medium· 6.7Cisco IOS XR Software Secure Boot Bypass Vulnerability (CVE-2025-20143)
A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Secure Boot functionality and load unverified software on an affected device. To exploit this vuln…
CVE-2025-20146High· 8.6Cisco IOS XR Software for ASR 9000 Series Routers Layer 3 Multicast Routing Denial of Service Vulnerability
A vulnerability in the Layer 3 multicast feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unaut…
CVE-2025-20175High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20169High· 7.7Cisco IOS, IOS XE, and IOS XR SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20174High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20171High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20170High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20176High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20172High· 7.7Cisco IOS, IOS XE, and IOS XR SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20173High· 7.7Cisco IOS and IOS XE SNMP Denial of Service Vulnerabilities
Multiple vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) co…
CVE-2025-20205Medium· 4.8Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) guest portals could allow an authenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interf…
Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) guest portals could allow an authenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interf…
CVE-2025-20204Medium· 4.8Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) guest portals could allow an authenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interf…
Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) guest portals could allow an authenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interf…
CVE-2024-20482Medium· 6.5A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software, formerly Firepower Management Center Software, could allow an authenticated, remote attacker to elevate privileges on an aff…
A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software, formerly Firepower Management Center Software, could allow an authenticated, remote attacker to elevate privileges on an aff…
CVE-2024-20260High· 8.6Update for September 16, 2026: The original 1.0 version of this advisory was specific to the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense Virtual (FTDv) models
Update for September 16, 2026: The original 1.0 version of this advisory was specific to the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense Virtual (FTDv) models. However, it was later found tha…
CVE-2024-20350High· 7.5Cisco Catalyst Center Static SSH Host Key Vulnerability (CVE-2024-20350)
A vulnerability in the SSH server of Cisco Catalyst Center, formerly Cisco DNA Center, could allow an unauthenticated, remote attacker to impersonate a Cisco Catalyst Center appliance. This vulnerability is due to the presence of a stat…
CVE-2024-20436High· 8.6Cisco IOS and IOS XE Software WebUI Denial of Service Vulnerability
A vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This v…
CVE-2024-20434Medium· 4.3Cisco Catalyst 9000 Series Switches Denial of Service Vulnerability (CVE-2024-20434)
A vulnerability in Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the control plane of an affected device. This vulnerability is due to improper handling of frames…
CVE-2024-20398High· 8.8Cisco IOS XR Software Local Privilege Escalation Vulnerability
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to obtain read/write file system access on the underlying operating system of an affected device. This vulnerability is due to insufficient…
CVE-2024-20304High· 8.6Cisco IOS XR Software Packet Memory Exhaustion Vulnerability
A vulnerability in the multicast traceroute version 2 (Mtrace2) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust the UDP packet memory of an affected device. This vulnerability exists because t…
CVE-2024-20390Medium· 5.3Cisco IOS XR Software Dedicated XML Agent TCP Denial of Service Vulnerability (CVE-2024-20390)
A vulnerability in the Dedicated XML Agent feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) on XML TCP listen port 38751. This vulnerability is due to a lack of proper e…
CVE-2024-20343Medium· 5.5Cisco IOS XR Software CLI Arbitrary File Read Vulnerability (CVE-2024-20343)
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to read any file in the file system of the underlying Linux operating system. The attacker must have valid credentials on the affected device.…
CVE-2024-20317High· 7.4Cisco IOS XR Software Layer 2 Services Denial of Service Vulnerability
A vulnerability in the handling of specific Ethernet frames by Cisco IOS XR Software for various Cisco Network Convergence System (NCS) platforms could allow an unauthenticated, adjacent attacker to cause critical priority packets to be dr…
CVE-2024-20443Medium· 5.4A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user-su…
A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user-su…
CVE-2024-20479Medium· 4.8A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user-su…
A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user-su…
CVE-2024-20419Critical· 10.0PoCA vulnerability in the authentication system of Cisco Smart Software Manager On-Prem (SSM On-Prem) could allow an unauthenticated, remote attacker to change the password of any user, including administrative users. This vulnerability …
A vulnerability in the authentication system of Cisco Smart Software Manager On-Prem (SSM On-Prem) could allow an unauthenticated, remote attacker to change the password of any user, including administrative users. This vulnerability …
CVE-2024-20373Medium· 5.3Cisco IOS and Cisco IOS XE SNMP Extended ACL Bypass Vulnerability
A vulnerability in the implementation of the Simple Network Management Protocol (SNMP) IPv4 access control list (ACL) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform SNMP p…
CVE-2024-20324Medium· 5.5WLAN config leak for lower privilege levels
A vulnerability in the CLI of Cisco IOS XE Software could allow an authenticated, low-privileged, local attacker to access WLAN configuration details including passwords. This vulnerability is due to improper privilege checks. An attack…
CVE-2024-20271High· 8.6Cisco Access Point Software Denial of Service Vulnerability (CVE-2024-20271)
A vulnerability in the IP packet processing of Cisco Access Point (AP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficien…
CVE-2024-20265Medium· 5.9Cisco Access Point Software Secure Boot Bypass Vulnerability (CVE-2024-20265)
A vulnerability in the boot process of Cisco Access Point (AP) Software could allow an unauthenticated, physical attacker to bypass the Cisco Secure Boot functionality and load a software image that has been tampered with on an affected de…