CVE-2019-1594: Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service Vulnerability
First published: Wed Mar 06 2019(Updated: )
A vulnerability in the 802.1X implementation for Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to incomplete input validation of Extensible Authentication Protocol over LAN (EAPOL) frames. An attacker could exploit this vulnerability by sending a crafted EAPOL frame to an interface on the targeted device. A successful exploit could allow the attacker to cause the Layer 2 (L2) forwarding process to restart multiple times, leading to a system-level restart of the device and a DoS condition. Note: This vulnerability affects only NX-OS devices configured with 802.1X functionality. Cisco Nexus 1000V Switch for VMware vSphere devices are affected in versions prior to 5.2(1)SV3(1.4b). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I7(4). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(4). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.3(5)N1(1) and 7.1(5)N1(1b). Nexus 7000 and 7700 Series Switches are affected in versions prior to 8.2(3). Nexus 9000 Series Fabric Switches in ACI Mode are affected in versions prior to 13.2(1l). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I7(4).
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Nx-os | <5.2\(1\)sv3\(1.4b\) | |
| Cisco Nexus 1000v | ||
| Cisco Nx-os | >=7.0\(3\)i7<7.0\(3\)i7\(4\) | |
| Cisco Nexus 3000 | ||
| Cisco Nexus 3500 | ||
| Cisco Nx-os | <7.1\(5\)n1\(1b\) | |
| Cisco Nexus 2000 | ||
| Cisco Nexus 5500 | ||
| Cisco Nexus 5600 | ||
| Cisco Nexus 6000 | ||
| Cisco Nx-os | >=8.3<8.3\(1\) | |
| Cisco Nexus 7000 | ||
| Cisco Nexus 7700 | ||
| Cisco Nx-os | <13.2\(1l\) | |
| Cisco Nexus 9000 | ||
| Cisco Nexus 9000 In Standalone Nx-os Mode | ||
| Cisco Nx-os | >=7.2<7.3\(5\)n1\(1\) | |
| Cisco Nx-os | >=8.0<8.2\(3\) | |
| Cisco Nx-os | >=7.2<7.3\(3\)d1\(1\) | |
| Cisco Nx-os | >=6.2<6.2\(20a\) | |
| All of | ||
| Cisco Nx-os | <5.2\(1\)sv3\(1.4b\) | |
| Cisco Nexus 1000v | ||
| All of | ||
| Cisco Nx-os | >=7.0\(3\)i7<7.0\(3\)i7\(4\) | |
| Any of | ||
| Cisco Nexus 3000 | ||
| Cisco Nexus 3500 | ||
| All of | ||
| Cisco Nx-os | <7.1\(5\)n1\(1b\) | |
| Any of | ||
| Cisco Nexus 2000 | ||
| Cisco Nexus 5500 | ||
| Cisco Nexus 5600 | ||
| Cisco Nexus 6000 | ||
| All of | ||
| Cisco Nx-os | >=8.3<8.3\(1\) | |
| Any of | ||
| Cisco Nexus 7000 | ||
| Cisco Nexus 7700 | ||
| All of | ||
| Cisco Nx-os | <13.2\(1l\) | |
| Cisco Nexus 9000 | ||
| All of | ||
| Cisco Nx-os | >=7.0\(3\)i7<7.0\(3\)i7\(4\) | |
| Cisco Nexus 9000 In Standalone Nx-os Mode | ||
| All of | ||
| Cisco Nx-os | >=7.2<7.3\(5\)n1\(1\) | |
| Any of | ||
| Cisco Nexus 2000 | ||
| Cisco Nexus 5500 | ||
| Cisco Nexus 5600 | ||
| Cisco Nexus 6000 | ||
| All of | ||
| Cisco Nx-os | >=8.0<8.2\(3\) | |
| Any of | ||
| Cisco Nexus 7000 | ||
| Cisco Nexus 7700 | ||
| All of | ||
| Cisco Nx-os | >=7.2<7.3\(3\)d1\(1\) | |
| Any of | ||
| Cisco Nexus 7000 | ||
| Cisco Nexus 7700 | ||
| All of | ||
| Cisco Nx-os | >=6.2<6.2\(20a\) | |
| Any of | ||
| Cisco Nexus 7000 | ||
| Cisco Nexus 7700 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2019-1594.
What is the severity of CVE-2019-1594?
The severity of CVE-2019-1594 is high with a CVSS score of 7.4.
What is the affected software?
The affected software is Cisco NX-OS Software versions 5.2(1)sv3(1.4b) to 13.2(1l), and 6.2 to 8.3(1).
How can an unauthenticated attacker exploit CVE-2019-1594?
An unauthenticated attacker can exploit CVE-2019-1594 by sending malicious Extensible Authentication Protocol over LAN (EAPOL) frames to the affected device, causing a denial of service (DoS) condition.
Where can I find more information about CVE-2019-1594?
You can find more information about CVE-2019-1594 on the Cisco Security Advisory and SecurityFocus websites.
- collector/nvd-index
- agent/type
- agent/references
- agent/weakness
- agent/remedy
- agent/severity
- agent/title
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/first-publish-date
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/author
- agent/softwarecombine
- agent/tags
- agent/event
- vendor/cisco
- canonical/cisco nx-os
- canonical/cisco nexus 1000v
- version/cisco nx-os/7.0\(3\)i7
- canonical/cisco nexus 3000
- canonical/cisco nexus 3500
- canonical/cisco nexus 2000
- canonical/cisco nexus 5500
- canonical/cisco nexus 5600
- canonical/cisco nexus 6000
- version/cisco nx-os/8.3
- canonical/cisco nexus 7000
- canonical/cisco nexus 7700
- canonical/cisco nexus 9000
- canonical/cisco nexus 9000 in standalone nx-os mode
- version/cisco nx-os/7.2
- version/cisco nx-os/8.0
- version/cisco nx-os/6.2