Zero-day vulnerability in Cisco IOS XR

Resource exhaustion

Not patched

On August 28, 2020, the Cisco Product Security Incident Response Team (PSIRT) became aware of attempted exploitation of this vulnerability in the wild.

Vulnerability details

Advisory: SB2020082902 - Denial of service in Cisco IOS XR Software

Vulnerable component: Cisco IOS XR

CVE-ID: CVE-2020-3566

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:H/RL:U/RC:C

CWE-ID: CWE-400 - Resource exhaustion


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient queue management for Internet Group Management Protocol (IGMP) packets in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco┬аIOS XR Software. A remote attacker can trigger resource exhaustion by sending crafted IGMP┬а traffic to the affected device and perform a denial of service (DoS) attack.

Note: this vulnerability is being actively exploited in the wild.

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