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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 catalogs known security vulnerabilities affecting Cisco IOS, categorized under common weakness types and assigned relevant tracking tags. It aggregates a comprehensive collection of flaws discovered in Cisco’s Internetwork Operating System, covering a broad historical time range from early releases to recent versions. These entries include issues related to buffer overflows, input validation errors, improper access controls, and protocol handling defects that have been publicly disclosed or privately reported. Readers can utilize this resource to track Cisco’s official security advisories and understand the prevalence of specific weakness classes within the ecosystem. By examining the vulnerability history of this product, users can assess the long-term impact of past flaws and identify patterns in security reporting. This structured approach aids security professionals in evaluating risk exposure, planning patch deployments, and comparing defense mechanisms across different software iterations. The data serves as a reference for understanding how specific coding errors or architectural decisions in Cisco IOS have historically led to exploitable conditions. It also helps in correlating internal findings with public reports to ensure comprehensive threat modeling. No marketing language is included; the focus remains strictly on factual security data aggregation and analysis for technical audiences seeking to improve their security posture against known threats in Cisco network infrastructure.

Vendor: n/a

CVE IDTitleCVSSSeverityPublished
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 Medium2023-03-23
CVE-2023-20080 Cisco IOS and IOS XE Software IPv6 DHCP (DHCPv6) Relay and Server Denial of Service Vulnerability CWE-129 8.6 High2023-03-23
CVE-2023-20076 Cisco IOx Application Hosting Environment Command Injection Vulnerability CWE-233 7.2 High2023-02-12
CVE-2022-20920 Cisco IOS and IOS XE Software SSH Denial of Service Vulnerability CWE-755 7.7 High2022-10-10
CVE-2022-20919 Cisco IOS and IOS XE Software Common Industrial Protocol Request Denial of Service Vulnerability CWE-248 8.6 High2022-09-30
CVE-2022-20720 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20721 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20722 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20723 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20724 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20725 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20726 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20727 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20761 Cisco 1000 Series Connected Grid Router Integrated Wireless Access Point Denial of Service Vulnerability CWE-248 7.4 High2022-04-15
CVE-2022-20677 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20697 Cisco IOS and IOS XE Software Web Services Denial of Service Vulnerability CWE-691 8.6 High2022-04-15
CVE-2022-20718 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2022-20719 Cisco IOx Application Hosting Environment Vulnerabilities CWE-22 5.5 Medium2022-04-15
CVE-2021-1620 Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability CWE-563 7.7 High2021-09-23
CVE-2021-34705 Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability CWE-232 5.3 Medium2021-09-23
CVE-2021-34714 Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability CWE-20 7.4 High2021-09-23
CVE-2021-34703 Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability CWE-456 6.8 Medium2021-09-23
CVE-2021-34699 Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability CWE-435 7.7 High2021-09-23
CVE-2021-1377 Cisco IOS and IOS XE Software ARP Resource Management Exhaustion Denial of Service Vulnerability CWE-399 5.8 Medium2021-03-24
CVE-2021-1385 Cisco IOx Application Environment Path Traversal Vulnerability CWE-22 6.5 Medium2021-03-24
CVE-2021-1391 Cisco IOS and IOS XE Software Privilege Escalation Vulnerability CWE-489 5.1 Medium2021-03-24
CVE-2021-1392 Cisco IOS and IOS XE Software Common Industrial Protocol Privilege Escalation Vulnerability CWE-522 7.8 High2021-03-24
CVE-2021-1460 Cisco IOx Application Framework Denial of Service Vulnerability CWE-400 5.3 Medium2021-03-24
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.