Live › vulnerability › CVE-2026-76505
Go to dashboardCrafted IPv4 packets sent to an affected line card interface and processed as for-us traffic can make the network processor error, reset, or shut down. An unauthenticated remote attacker can cause a line card reset or persistent shutdown, causing denial of service and traffic loss.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Operators of Cisco ASR 9000 and 9900 Series Aggregation Services Routers and ASR 9902 and 9903 Compact routers running affected IOS XR software. The flaw is reached by IPv4 packets addressed to the router's line card interfaces, so exposure depends on whether those interfaces accept traffic from untrusted networks. Transit IPv4 traffic does not trigger it and IPv6 traffic cannot trigger it.
No product ranges from the sources yet.
show version on ASR 9000, 9900, 9902 and 9903 routers and compare it with the fixed releases in the Cisco advisoryEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network processor (NP) errors, resulting in a line card reset or shutdown and a denial of service (DoS) condition.
This vulnerability is due to the incorrect handling of crafted IPv4 packets that are received on an affected line card interface and processed as for-us traffic. The issue can result in an NP reset, causing traffic loss on the affected line card while it recovers. Under repeated reset conditions, the network processor may enter a persistent shutdown state, in which case an explicit line card reload may be required to restore traffic. The vulnerability is within the IPv4 packet-processing path. Transit IPv4 traffic does not trigger this issue and IPv6 traffic cannot trigger it.
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