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-2022-20794Medium· 4.7vuln-CVE-2022-20794
Multiple vulnerabilities in the web engine of Cisco Telepresence CE Software and RoomOS Software could allow a remote attacker to cause a denial of service (DoS) condition, redirect users to an attacker controlled destination or view sensi…
CVE-2022-20764Medium· 6.5Cisco RoomsOS Denial of Service Vulnerability
Multiple vulnerabilities in the web engine of Cisco Telepresence CE Software and RoomOS Software could allow a remote attacker to cause a denial of service (DoS) condition, redirect users to an attacker controlled destination or view sensi…
CVE-2022-20783High· 7.5Cisco Telepresence CE and RoomOS Software Denial of Service Vulnerability
A vulnerability in the packet processing functionality of Cisco TelePresence Collaboration Endpoint (CE) Software and Cisco RoomOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an …
CVE-2022-20622High· 8.6Cisco Aironet Access Points ICMP Denial of Service Vulnerability
A vulnerability in IP ingress packet processing of the Cisco Embedded Wireless Controller with Catalyst Access Points Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, causing a denial of …
CVE-2021-1529High· 7.8Cisco IOS XE SD-WAN Software Command Injection Vulnerability (CVE-2021-1529)
A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. The vulnerability is due to insufficient input validation by the system CLI. An …
CVE-2021-34758NoneCisco TelePresence Collaboration Endpoint and RoomOS Software Denial of Service Vulnerability
It was previously published that a vulnerability in the memory management of Cisco TelePresence Collaboration Endpoint (CE) Software and Cisco RoomOS Software could allow an authenticated, local attacker to corrupt a shared memory segment,…
CVE-2021-34725Medium· 6.7Cisco IOS XE SD-WAN Command Injection Vulnerability
A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to inject arbitrary commands to be executed with root-level privileges on the underlying operating system. This vulnerability is due…
CVE-2021-1625Medium· 5.8Cisco IOS XE Software Zone Based Firewall ICMP and UDP Inspection Vulnerability
A vulnerability in the Zone-Based Policy Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent the Zone-Based Policy Firewall from correctly classifying traffic. This vulnerability exists b…
CVE-2021-1619Critical· 9.8Cisco IOS XE Software NETCONF/RESTCONF AAA Vulnerability
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: In…
CVE-2021-34727Critical· 9.8Cisco IOS XE SD-WAN Software Buffer Overflow Vulnerability (CVE-2021-34727)
A vulnerability in the vDaemon process in Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. This vulnerability is due to insufficient bounds checking when an a…
CVE-2021-1612Medium· 5.5Cisco IOS XE SD-WAN Arbitrary File Overwrite Vulnerability
A vulnerability in the Cisco IOS XE SD-WAN Software CLI could allow an authenticated, local attacker to overwrite arbitrary files on the local system. This vulnerability is due to improper access controls on files within the local file …
CVE-2021-34740High· 7.4Cisco Aironet Access Points WLAN Control Protocol Packet Buffer Leak Denial of Service Vulnerability (CVE-2021-34740)
A vulnerability in the WLAN Control Protocol (WCP) implementation for Cisco Aironet Access Point (AP) software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS…
CVE-2021-1419High· 7.8Cisco Aironet Access Points Privilege Escalation Vulnerability
A vulnerability in the SSH management feature of multiple Cisco Access Points (APs) platforms could allow a local, authenticated user to modify files on the affected device and possibly gain escalated privileges. The vulnerability is du…
CVE-2021-1532Medium· 6.5Cisco Telepresence CE and RoomOS Software Arbitrary File Read Vulnerability
A vulnerability in the video endpoint API (xAPI) of Cisco TelePresence Collaboration Endpoint (CE) Software and Cisco RoomOS Software could allow an authenticated, remote attacker to read arbitrary files from the underlying operating syste…
CVE-2021-1448High· 7.8A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges on the underlying operating system of an affected device that is …
A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges on the underlying operating system of an affected device that is …
CVE-2021-1445High· 8.6Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device
Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. …
CVE-2021-1402High· 8.6A vulnerability in the software-based SSL/TLS message handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (D…
A vulnerability in the software-based SSL/TLS message handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (D…
CVE-2021-1256Medium· 6.0A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite files on the file system of an affected device by using directory traversal techniques
A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite files on the file system of an affected device by using directory traversal techniques. A successful ex…
CVE-2021-1451High· 8.1Cisco IOS XE Software Easy Virtual Switching System Arbitrary Code Execution
A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitr…
CVE-2021-1432High· 7.3A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system as the root user
A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system as the root user. The attacker must be authenticated on the affected…
CVE-2021-1371Medium· 6.6Cisco SD-WAN Software Improper Privilege Management Vulnerability
A vulnerability in the role-based access control of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker with read-only privileges to obtain administrative privileges by using the console port when the device is in the…
CVE-2021-1449Medium· 6.7Cisco Aironet Access Points Privilege Escalation Vulnerability
A vulnerability in the boot logic of Cisco Access Points Software could allow an authenticated, local attacker to execute unsigned code at boot time. The vulnerability is due to an improper check that is performed by the area of code th…
CVE-2021-1437High· 7.5Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability (CVE-2021-1437)
A vulnerability in the FlexConnect Upgrade feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, remote attacker to obtain confidential information from an affected device. This vulnerability is due to a…
CVE-2021-1273High· 7.5Cisco SD-WAN Denial of Service Vulnerabilties
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details […
CVE-2021-1279Medium· 5.3Cisco SD-WAN Denial of Service Vulnerabilties
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details […
CVE-2021-1278Medium· 5.5Cisco SD-WAN Denial of Service Vulnerabilties
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details […
CVE-2021-1274High· 7.5Cisco SD-WAN Denial of Service Vulnerabilties
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details […
CVE-2021-1241High· 8.6Cisco SD-WAN vEdge Routers Denial of Service Vulnerability
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details […
CVE-2021-1236Medium· 5.3Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system
Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a…
CVE-2021-1224Medium· 5.8Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP
Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. T…