Cisco IOS XR Software

11 known vulnerabilities in Cisco IOS XR Software, 2 critical, 4 actively exploited, with patch priority, exploit likelihood and the news covering them.

Recently exploited

  • CVE-2022-20821 CVSS 6.5 medium · actively exploited Cisco IOS XR Open Port Vulnerability
  • CVE-2020-3569 CVSS 8.6 high · actively exploited Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
  • CVE-2020-3566 CVSS 8.6 high · actively exploited Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
  • CVE-2020-3118 CVSS 8.8 high · actively exploited Cisco IOS XR Software Discovery Protocol Format String Vulnerability

Latest vulnerabilities

  • CVE-2026-20280 CVSS 8.8 high As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has…
  • CVE-2026-20279 CVSS 9.8 critical As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2026-20278 CVSS 8.8 high As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2026-20277 CVSS 8.2 high As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2026-20276 CVSS 8.6 high As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2026-20275 CVSS 8.8 high As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2026-20274 CVSS 9.8 critical As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted…
  • CVE-2022-20821 CVSS 6.5 medium · actively exploited Cisco IOS XR Open Port Vulnerability
  • CVE-2020-3569 CVSS 8.6 high · actively exploited Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
  • CVE-2020-3566 CVSS 8.6 high · actively exploited Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
  • CVE-2020-3118 CVSS 8.8 high · actively exploited Cisco IOS XR Software Discovery Protocol Format String Vulnerability