# Cisco IOS XR vulnerabilities Source: https://junglewise.ai/threats/technologies/ios-xr Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/ios-xr.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 31 vulnerabilities in Cisco IOS XR: 0 in the last 7 days and 2 in the last 90 days, 27 of them critical and 27 exploited in the wild. The most recent, CVE-2026-76505, was published on 21 October 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 1 - Last 90 days: 2 - All time: 31 (27 critical, 27 exploited in the wild) ## About Cisco IOS XR Cisco router and networking device operating system providing internetworking functionality for service providers. ## Latest Cisco IOS XR vulnerabilities - [CVE-2026-76505: Cisco IOS XR IPv4 packet processing denial of service](https://junglewise.ai/threats/cve-2026-76505-a-vulnerability-in-the-ipv4-packet-processing-functionality-of) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2026-20278: Cisco IOS XR Software improper neutralization in command processing](https://junglewise.ai/threats/cve-2026-20278-cisco-ios-xr-software-improper-neutralization-in-command) (high, CVSS 8.8, published 2 Sep 2026) - [CVE-2026-20046: Cisco IOS XR Software privilege escalation in task group assignment](https://junglewise.ai/threats/cve-2026-20046-cisco-ios-xr-software-privilege-escalation-in-task-group) (high, CVSS 8.8, published 11 Mar 2026) - [CVE-2026-20040: Cisco IOS XR Software privilege escalation in CLI](https://junglewise.ai/threats/cve-2026-20040-cisco-ios-xr-software-privilege-escalation-in-cli) (high, CVSS 8.8, published 11 Mar 2026) - [CVE-2025-20352: Cisco IOS and IOS XE stack overflow in SNMP subsystem](https://junglewise.ai/threats/cve-2025-20352-cisco-ios-and-ios-xe-stack-overflow-in-snmp-subsystem) (critical, exploited in the wild, CVSS 7.7, published 29 Sep 2025) - [CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability](https://junglewise.ai/threats/cve-2023-20109-cisco-ios-and-ios-xe-group-encrypted-transport-vpn-out-of-bounds) (critical, exploited in the wild, CVSS 6.6, published 10 Oct 2023) - [CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2004-1464-cisco-ios-denial-of-service-vulnerability) (critical, exploited in the wild, CVSS 5.9, published 19 May 2023) - [CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability](https://junglewise.ai/threats/cve-2016-6415-cisco-ios-ios-xr-and-ios-xe-ikev1-information-disclosure) (critical, exploited in the wild, CVSS 7.5, published 19 May 2023) - [CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6742-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 19 Apr 2023) - [CVE-2022-20821: Cisco IOS XR Open Port Vulnerability](https://junglewise.ai/threats/cve-2022-20821-cisco-ios-xr-open-port-vulnerability) (critical, exploited in the wild, CVSS 6.5, published 23 May 2022) - [CVE-2009-2055: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2009-2055-cisco-ios-xr-border-gateway-protocol-bgp-denial-of-service) (critical, exploited in the wild, CVSS 5.9, published 25 Mar 2022) - [CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-3881-cisco-ios-and-ios-xe-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) - [CVE-2010-3035: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2010-3035-cisco-ios-xr-border-gateway-protocol-bgp-denial-of-service) (critical, exploited in the wild, CVSS 7.5, published 25 Mar 2022) - [CVE-2017-6737: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6737-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6738-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6743-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2017-6663-cisco-ios-software-and-cisco-ios-xe-software-denial-of-service) (critical, exploited in the wild, CVSS 6.5, published 3 Mar 2022) - [CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6740-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6739-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2018-0151-cisco-ios-software-and-cisco-ios-xe-software-quality-of-service) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2017-6627: Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2017-6627-cisco-ios-software-and-cisco-ios-xe-software-udp-packet-processing) (critical, exploited in the wild, CVSS 7.5, published 3 Mar 2022) - [CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6736-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-12240-cisco-ios-and-ios-xe-software-dhcp-remote-code-execution) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2018-0175: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2018-0175-cisco-ios-xr-and-xe-software-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 8, published 3 Mar 2022) - [CVE-2017-12237: Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2017-12237-cisco-ios-and-ios-xe-software-internet-key-exchange-denial-of) (critical, exploited in the wild, CVSS 7.5, published 3 Mar 2022) ## Most severe Cisco IOS XR vulnerabilities - [CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-3881-cisco-ios-and-ios-xe-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) - [CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-12240-cisco-ios-and-ios-xe-software-dhcp-remote-code-execution) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2018-0151-cisco-ios-software-and-cisco-ios-xe-software-quality-of-service) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6742-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 19 Apr 2023) - [CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6739-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6743-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6740-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6738-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6736-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2018-0167: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2018-0167-cisco-ios-xr-and-xe-software-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 1 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 1 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Cisco technologies - [Cisco IOS](https://junglewise.ai/threats/technologies/ios): 70 vulnerabilities - [Cisco Identity Services Engine](https://junglewise.ai/threats/technologies/identity-services-engine): 58 vulnerabilities - [Cisco IOS XE](https://junglewise.ai/threats/technologies/ios-xe): 57 vulnerabilities - [Cisco Firepower Threat Defense](https://junglewise.ai/threats/technologies/firepower-threat-defense): 33 vulnerabilities - [Cisco Firepower Threat Defense Software](https://junglewise.ai/threats/technologies/firepower-threat-defense-software): 33 vulnerabilities - [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software): 28 vulnerabilities - [Cisco Adaptive Security Appliance Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software): 23 vulnerabilities - [Cisco Snort 3](https://junglewise.ai/threats/technologies/snort-3): 20 vulnerabilities - [Cisco Ios Software](https://junglewise.ai/threats/technologies/ios-software): 19 vulnerabilities - [Cisco ISE Passive Identity Connector](https://junglewise.ai/threats/technologies/ise-passive-identity-connector): 19 vulnerabilities - [Cisco Secure Firewall Management Center](https://junglewise.ai/threats/technologies/secure-firewall-management-center): 16 vulnerabilities - [Cisco Unity Connection](https://junglewise.ai/threats/technologies/unity-connection): 16 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Cisco IOS XR vulnerabilities", https://junglewise.ai/threats/technologies/ios-xr, 11 November 2026.