Technology · Cisco

Cisco IOS XR vulnerabilities

Updated 11 November 2026, 03:07 UTC. Rebuilt every hour.

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.

Last 7 days: 0
Last 90 days: 2
Critical, all time: 27
Exploited in the wild: 27

About Cisco IOS XR

Cisco router and networking device operating system providing internetworking functionality for service providers.

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Latest Cisco IOS XR vulnerabilities

CVE-2026-76505: Cisco IOS XR IPv4 packet processing denial of servicehighCVSS 7.521 Oct 2026
CVE-2026-20278: Cisco IOS XR Software improper neutralization in command processinghighCVSS 8.8EPSS 0.3%2 Sep 2026
CVE-2026-20046: Cisco IOS XR Software privilege escalation in task group assignmenthighCVSS 8.8EPSS 0.1%11 Mar 2026
CVE-2026-20040: Cisco IOS XR Software privilege escalation in CLIhighCVSS 8.8EPSS 0.2%11 Mar 2026
CVE-2025-20352: Cisco IOS and IOS XE stack overflow in SNMP subsystemcriticalexploited in the wildCVSS 7.7EPSS 3.6%29 Sep 2025
CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerabilitycriticalexploited in the wildCVSS 6.610 Oct 2023
CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.919 May 2023
CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerabilitycriticalexploited in the wildCVSS 7.519 May 2023
CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.819 Apr 2023
CVE-2022-20821: Cisco IOS XR Open Port Vulnerabilitycriticalexploited in the wildCVSS 6.523 May 2022
CVE-2009-2055: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.925 Mar 2022
CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.825 Mar 2022
CVE-2010-3035: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.525 Mar 2022
CVE-2017-6737: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 6.53 Mar 2022
CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.83 Mar 2022
CVE-2017-6627: Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.53 Mar 2022
CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.83 Mar 2022
CVE-2018-0175: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 83 Mar 2022
CVE-2017-12237: Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.53 Mar 2022

Most severe Cisco IOS XR vulnerabilities

Exploited in the wild first, then by severity and CVSS score.

CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.825 Mar 2022
CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.83 Mar 2022
CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.83 Mar 2022
CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.819 Apr 2023
CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022
CVE-2018-0167: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 8.83 Mar 2022

Vulnerabilities per week

1 vulnerability in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.

Vulnerabilities published per week, UTC
Week of	Bar	Vulns	Critical
17 Aug 2026		0	0
24 Aug 2026		0	0
31 Aug 2026		1	0
7 Sep 2026		0	0
14 Sep 2026		0	0
21 Sep 2026		0	0
28 Sep 2026		0	0
5 Oct 2026		0	0
12 Oct 2026		0	0
19 Oct 2026		1	0
26 Oct 2026		0	0
2 Nov 2026		0	0
9 Nov 2026		0	0

Embed a badge

A live badge for a README, a status page or an internal wiki: how many Cisco IOS XR vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.

[![Cisco IOS XR vulnerabilities](https://junglewise.ai/threats/technologies/ios-xr/badge.svg)](https://junglewise.ai/threats/technologies/ios-xr)

<a href="https://junglewise.ai/threats/technologies/ios-xr"><img src="https://junglewise.ai/threats/technologies/ios-xr/badge.svg" alt="Cisco IOS XR vulnerabilities" /></a>

How this is built

Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.

The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.

Use this data

The same data is at https://junglewise.ai/threats/technologies/ios-xr.json, and this page as text at https://junglewise.ai/threats/technologies/ios-xr.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.

Cite as: Junglewise Threat Intelligence, "Cisco IOS XR vulnerabilities", https://junglewise.ai/threats/technologies/ios-xr, 11 November 2026.