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Cisco IOS — Vulnerabilities & Security Advisories 51

All 51 CVE vulnerabilities found in Cisco IOS, with AI-generated Chinese analysis, references, and POCs.

This page aggregates known security vulnerabilities specifically affecting the Cisco IOS product line, categorized primarily by common weakness types such as buffer overflows and input validation errors. The collection includes a comprehensive historical record of security advisories issued by the vendor, covering defects discovered and published from the mid-1990s through the present day. Readers can use this resource to track the latest vendor-issued advisories, analyze the evolution of specific weakness classes within the IOS codebase, and review the complete vulnerability history of the product to identify recurring patterns. The data serves as a technical reference for network security teams auditing device firmware, supporting risk assessment and patch management strategies. By filtering by component or year, users can isolate incidents relevant to their infrastructure configuration.

Vendor: n/a

CVE ID Title CVSS Severity Published
CVE-2023-20081 Cisco Adaptive Security Appliance Software, Firepower Threat Defense Software, IOS Software, and IOS XE Software IPv6 DHCP (DHCPv6) Client Denial of Service Vulnerability CWE-122 6.8 Medium 2023-03-23
CVE-2023-20080 Cisco IOS and IOS XE Software IPv6 DHCP (DHCPv6) Relay and Server Denial of Service Vulnerability CWE-129 8.6 High 2023-03-23
CVE-2023-20076 Cisco IOx Application Hosting Environment Command Injection Vulnerability CWE-233 7.2 High 2023-02-12
CVE-2022-20920 Cisco IOS and IOS XE Software SSH Denial of Service Vulnerability CWE-755 7.7 High 2022-10-10
CVE-2022-20919 Cisco IOS and IOS XE Software Common Industrial Protocol Request Denial of Service Vulnerability CWE-248 8.6 High 2022-09-30
CVE-2022-20720 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20721 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20722 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20723 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20724 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20725 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20726 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20727 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20761 Cisco 1000 Series Connected Grid Router Integrated Wireless Access Point Denial of Service Vulnerability CWE-248 7.4 High 2022-04-15
CVE-2022-20677 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20697 Cisco IOS and IOS XE Software Web Services Denial of Service Vulnerability CWE-691 8.6 High 2022-04-15
CVE-2022-20718 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2022-20719 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium 2022-04-15
CVE-2021-1620 Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability CWE-563 7.7 High 2021-09-23
CVE-2021-34705 Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability CWE-232 5.3 Medium 2021-09-23
CVE-2021-34714 Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability CWE-20 7.4 High 2021-09-23
CVE-2021-34703 Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability CWE-456 6.8 Medium 2021-09-23
CVE-2021-34699 Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability CWE-435 7.7 High 2021-09-23
CVE-2021-1377 Cisco IOS and IOS XE Software ARP Resource Management Exhaustion Denial of Service Vulnerability CWE-399 5.8 Medium 2021-03-24
CVE-2021-1385 Cisco IOx Application Environment Path Traversal Vulnerability CWE-22 6.5 Medium 2021-03-24
CVE-2021-1391 Cisco IOS and IOS XE Software Privilege Escalation Vulnerability CWE-489 5.1 Medium 2021-03-24
CVE-2021-1392 Cisco IOS and IOS XE Software Common Industrial Protocol Privilege Escalation Vulnerability CWE-522 7.8 High 2021-03-24
CVE-2021-1460 Cisco IOx Application Framework Denial of Service Vulnerability CWE-400 5.3 Medium 2021-03-24
CVE-2020-3408 Cisco IOS and IOS XE Software Split DNS Denial of Service Vulnerability CWE-185 8.6 - 2020-09-24
CVE-2020-3409 Cisco IOS and IOS XE Software PROFINET Denial of Service Vulnerability CWE-20 7.4 - 2020-09-24

All 51 known CVE vulnerabilities affecting Cisco IOS with full Chinese analysis, references, and POCs where available.