CVE-2024-20406 (GCVE-0-2024-20406)
Vulnerability from cvelistv5
Published
2024-09-11 16:38
Modified
2024-09-11 20:38
Severity ?
7.4 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
  • CWE-20 - Improper Input Validation
Summary
A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type.
References
Impacted products
Vendor Product Version
Cisco Cisco IOS XR Software Version: 7.4.1
Version: 6.8.1
Version: 7.4.15
Version: 7.5.1
Version: 7.4.16
Version: 7.6.1
Version: 7.5.2
Version: 7.8.1
Version: 7.6.15
Version: 7.5.12
Version: 7.7.1
Version: 6.8.2
Version: 7.4.2
Version: 6.9.1
Version: 7.6.2
Version: 7.5.3
Version: 7.7.2
Version: 6.9.2
Version: 7.9.1
Version: 7.10.1
Version: 7.8.2
Version: 7.5.4
Version: 7.8.22
Version: 7.7.21
Version: 7.9.2
Version: 7.5.5
Version: 7.11.1
Version: 7.9.21
Version: 7.10.2
Version: 7.6.3
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                "id": "CVE-2024-20406",
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          "value": "A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type."
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      "exploits": [
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            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
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            "scope": "CHANGED",
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    "dateReserved": "2023-11-08T15:08:07.661Z",
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    "state": "PUBLISHED"
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