Technology · Cisco
Cisco IOS XR vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 30 vulnerabilities in Cisco IOS XR: 0 in the last 7 days and 1 in the last 90 days, 27 of them critical and 27 exploited in the wild. The most recent, CVE-2026-20278, was published on 2 September 2026.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 27
- Exploited in the wild
- 27
About Cisco IOS XR
A network operating system designed for high-availability service provider routers and networking equipment.
Latest Cisco IOS XR vulnerabilities
- CVE-2026-20278: Cisco IOS XR Software improper neutralization in command processinghighCVSS 8.8EPSS 0.3%
- CVE-2026-20046: Cisco IOS XR Software privilege escalation in task group assignmenthighCVSS 8.8EPSS 0.1%
- CVE-2026-20040: Cisco IOS XR Software privilege escalation in CLIhighCVSS 8.8EPSS 0.2%
- CVE-2025-20352: Cisco IOS and IOS XE stack overflow in SNMP subsystemcriticalexploited in the wildCVSS 7.7EPSS 3.6%
- CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerabilitycriticalexploited in the wildCVSS 6.6
- CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.9
- CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2022-20821: Cisco IOS XR Open Port Vulnerabilitycriticalexploited in the wildCVSS 6.5
- CVE-2009-2055: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.9
- CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2010-3035: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2017-6737: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 6.5
- CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2017-6627: Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-0175: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 8
- CVE-2017-12237: Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerabilitycriticalexploited in the wildCVSS 8.6
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 9.8
- CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6736: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2018-0167: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 8.8
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 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 |
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, 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, 26 September 2026.