Answer in brief
CVE-2026-76505 records a High severity (CVSS 7.5) vulnerability in Cisco IOS XR Software for ASR 9000 Series Routers IPv4 Unicast Packets Denial of Service Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XR Softwaregeneric | 7.0.1 || 7.1.1 || 7.0.90 || 6.7.1 || 7.0.2 || 7.1.15 || 7.1.2 || 6.7.2 || 7.1.25 || 7.1.3 || 6.7.3 || 7.3.1 || 7.4.1 || 6.8.1 || 7.3.2 || 7.5.1 || 7.6.1 || 7.5.2 || 7.3.3 || 6.8.2 || 7.7.1 || 7.4.2 || 7.3.4 || 6.7.35 || 6.9.1 || 7.6.2 || 7.8.1 || 7.5.3 || 7.7.2 || 6.9.2 || 7.9.1 || 7.8.2 || 7.5.4 || 7.8.22 || 7.10.1 || 7.9.2 || 7.3.5 || 7.5.5 || 7.11.1 || 7.9.21 || 7.10.2 || 24.1.1 || 7.11.2 || 24.2.1 || 24.1.2 || 24.3.1 || 24.4.1 || 24.2.2 || 7.8.23 || 7.11.21 || 24.3.2 || 24.3.20 || 24.3.30 | Not reported |
Published upstream
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.