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ios-xr-software

CVE-2026-76505 is a high-severity vulnerability in Cisco IOS XR Software affecting specific Cisco ASR 9000 and 9900 Series routers. It involves improper input validation in the IPv4 packet processing path, allowing an unauthenticated remote attacker to cause network processor errors. This can lead to line card resets or shutdowns, resulting in denial of service (DoS). The vulnerability does not affect transit IPv4 traffic or IPv6 traffic. Multiple specific software versions are affected.

This vulnerability in Cisco IOS XR Software occurs due to incorrect handling of specially crafted IPv4 packets received on affected line card interfaces and processed as for-us traffic. The flaw causes network processor resets, leading to traffic loss on the impacted line card during recovery. Repeated resets may cause the network processor to enter a persistent shutdown state, requiring manual line card reload to restore functionality. The issue is limited to IPv4 packets destined for the device; transit IPv4 and IPv6 packets do not trigger the vulnerability. Affected products include Cisco ASR 9000 and 9900 Series Aggregation Services Routers and Cisco ASR 9902 and 9903 Compact High-Performance Routers.

CVE-2026-76505 is a high-severity vulnerability in Cisco IOS XR Software affecting specific Cisco ASR 9000 and 9900 Series routers. It involves improper input validation in the IPv4 packet processing path, allowing an unauthenticated remote attacker to cause network processor errors. This can lead t

CVE-2026-76505: Improper Input Validation in Cisco Cisco IOS XR Software

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