Cisco NX-OS on Nexus 5000/Nexus 6000/Nexus 7000 IS-IS Protocol resource management

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability has been found in Cisco NX-OS 7.1(3)N1(2.1)/7.1(3)N1(3.12)/7.3(2)N1(0.296)/8.0(1)S2 on Nexus 5000/Nexus 6000/Nexus 7000 (Router Operating System) and classified as problematic. This vulnerability affects an unknown function of the component IS-IS Protocol Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in Intermediate System-to-Intermediate System (IS-IS) protocol packet processing of Cisco Nexus 5000, 6000, and 7000 Series Switches software could allow an unauthenticated, adjacent attacker to cause a reload of the affected device. Switches in the FabricPath domain crash because of an __inst_001__isis_fabricpath hap reset when processing a crafted link-state packet. More Information: CSCvc45002. Known Affected Releases: 7.1(3)N1(2.1) 7.1(3)N1(3.12) 7.3(2)N1(0.296) 8.0(1)S2. Known Fixed Releases: 6.2(18)S11 7.0(3)I5(1.170) 7.0(3)I5(2) 7.1(4)N1(0.4) 7.1(4)N1(1b) 7.1(5)N1(0.986) 7.1(5)N1(1) 7.2(3)D1(0.8) 7.3(2)N1(0.304) 7.3(2)N1(1) 8.0(0.96)S0 8.0(1) 8.0(1)E1 8.0(1)S4 8.3(0)CV(0.788).

The bug was discovered 01/18/2017. The weakness was presented 01/26/2017 with Cisco as CSCvc45002 as confirmed advisory (Website). The advisory is available at This vulnerability was named CVE-2017-3804 since 12/21/2016. The attack needs to approached within the local network. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 102995 (Cisco NX-OS IS-IS Packet Processing Denial of Service Vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316070 (Cisco Nexus Switches Software IS-IS Packet Processing Denial of Service Vulnerability (cisco-sa-20170118-nexus)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (102995).








  • end of life (old version)

CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
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NVD Base Score: 6.1
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Class: Resource management
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

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Nessus ID: 102995
Nessus Name: Cisco NX-OS IS-IS Packet Processing Denial of Service Vulnerability
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OpenVAS ID: 103402
OpenVAS Name: Cisco Nexus 5000, 6000, and 7000 Series Switches Software IS-IS Packet Processing Denial of Service Vulnerability
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Threat Intelligenceinfo

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Recommended: Upgrade
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12/21/2016 🔍
01/18/2017 +28 days 🔍
01/18/2017 +0 days 🔍
01/18/2017 +0 days 🔍
01/26/2017 +8 days 🔍
01/26/2017 +0 days 🔍
01/26/2017 +0 days 🔍
09/07/2017 +224 days 🔍
11/04/2022 +1884 days 🔍



Advisory: CSCvc45002
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-3804 (🔍)
SecurityTracker: 1037658
SecurityFocus: 95638 - Multiple Cisco Nexus Devices CVE-2017-3804 Denial of Service Vulnerability


Created: 01/26/2017 02:58 PM
Updated: 11/04/2022 08:48 AM
Changes: 01/26/2017 02:58 PM (73), 06/06/2020 07:05 PM (8), 11/04/2022 08:48 AM (3)
Complete: 🔍


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