7.4
CWE
20 264
Advisory Published
Updated

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

Affected SoftwareAffected VersionHow 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\(20a\)

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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.

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