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TI-2019-01221 Aliases CVE-2019-1594GHSA-3pp4-86vv-j53p

Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service Vulnerability

Priority LOW 34CWE-264Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-264.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00805 56th percentileScored 2026-11-07
Fix Fixed Nexus 1000V Switch for VMware vSphere (Cisco): 5.2(1)SV3(1.4b)Nexus 3000 Series Switches (Cisco): 7.0(3)I7(4)+5 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoNexus 1000V Switch for VMware vSpherebefore 5.2(1)SV3(1.4b)5.2(1)SV3(1.4b)Patch availableCNA
CiscoNexus 3000 Series Switchesbefore 7.0(3)I7(4)7.0(3)I7(4)Patch availableCNA
CiscoNexus 3500 Platform Switchesbefore 7.0(3)I7(4)7.0(3)I7(4)Patch availableCNA
CiscoNexus 2000, 5500, 5600, and 6000 Series Switchesbefore 7.3(5)N1(1); before 7.1(5)N1(1b)7.3(5)N1(1), 7.1(5)N1(1b)Patch availableCNA
CiscoNexus 7000 and 7700 Series Switchesbefore 8.2(3)8.2(3)Patch availableCNA
CiscoNexus 9000 Series Fabric Switches in ACI Modebefore 13.2(1l)13.2(1l)Patch availableCNA
CiscoNexus 9000 Series Switches in Standalone NX-OS Modebefore 7.0(3)I7(4)7.0(3)I7(4)Patch availableCNA
  • Nexus 1000V Switch for VMware vSphere VendorCisco Affected before 5.2(1)SV3(1.4b) Fixed in 5.2(1)SV3(1.4b) Patch available CNA
  • Nexus 3000 Series Switches VendorCisco Affected before 7.0(3)I7(4) Fixed in 7.0(3)I7(4) Patch available CNA
  • Nexus 3500 Platform Switches VendorCisco Affected before 7.0(3)I7(4) Fixed in 7.0(3)I7(4) Patch available CNA
  • Nexus 2000, 5500, 5600, and 6000 Series Switches VendorCisco Affected before 7.3(5)N1(1); before 7.1(5)N1(1b) Fixed in 7.3(5)N1(1), 7.1(5)N1(1b) Patch available CNA
  • Nexus 7000 and 7700 Series Switches VendorCisco Affected before 8.2(3) Fixed in 8.2(3) Patch available CNA
  • Nexus 9000 Series Fabric Switches in ACI Mode VendorCisco Affected before 13.2(1l) Fixed in 13.2(1l) Patch available CNA
  • Nexus 9000 Series Switches in Standalone NX-OS Mode VendorCisco Affected before 7.0(3)I7(4) Fixed in 7.0(3)I7(4) Patch available CNA

CPE configurations NVD · 17

CPEVersionsRoleVendor
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 5.2\(1\)sv3\(1.4b\)VulnerableCisco
cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:vmware_vsphere:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*7.0\(3\)i7 to before 7.0\(3\)i7\(4\)VulnerableCisco
cpe:2.3:h:cisco:nexus_3000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_3500:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 7.1\(5\)n1\(1b\)VulnerableCisco
cpe:2.3:h:cisco:nexus_2000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_5500:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_5600:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_6000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 5.2\(1\)sv3\(1.4b\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 7.0\(3\)i7 to before 7.0\(3\)i7\(4\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_3000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_3500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 7.1\(5\)n1\(1b\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_2000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_5500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_5600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_6000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 7 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*8.3 to before 8.3\(1\)VulnerableCisco
cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 13.2\(1l\)VulnerableCisco
cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_9000_in_standalone_nx-os_mode:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*7.2 to before 7.3\(5\)n1\(1\); 8.0 to before 8.2\(3\); 7.2 to before 7.3\(3\)d1\(1\); 6.2 to before 6.2\(20a\)VulnerableCisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 8.3 to before 8.3\(1\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 13.2\(1l\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_9000_in_standalone_nx-os_mode:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 7.2 to before 7.3\(5\)n1\(1\); 8.0 to before 8.2\(3\); 7.2 to before 7.3\(3\)d1\(1\); 6.2 to before 6.2\(20a\) Vulnerable ·Cisco

Remediation

  • Fix · CNA Nexus 1000V Switch for VMware vSphere (Cisco) Fixed in 5.2(1)SV3(1.4b)
  • Fix · CNA Nexus 3000 Series Switches (Cisco) Fixed in 7.0(3)I7(4)
  • Fix · CNA Nexus 3500 Platform Switches (Cisco) Fixed in 7.0(3)I7(4)
  • Fix · CNA Nexus 2000, 5500, 5600, and 6000 Series Switches (Cisco) Fixed in 7.3(5)N1(1), 7.1(5)N1(1b)
  • Fix · CNA Nexus 7000 and 7700 Series Switches (Cisco) Fixed in 8.2(3)
  • Fix · CNA Nexus 9000 Series Fabric Switches in ACI Mode (Cisco) Fixed in 13.2(1l)
  • Fix · CNA Nexus 9000 Series Switches in Standalone NX-OS Mode (Cisco) Fixed in 7.0(3)I7(4)

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Cisco Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 7000 and 7700 Series Switches 7.0(3)I7(4), 8.2(3)

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2019-01220 Cisco NX-OS Software Bash Shell Role-Based Access Control Bypass Privilege Escalation VulnerabilityPriority LOW 36
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-1594
  2. 2026-10-03 Alias added: GHSA-3pp4-86vv-j53p

References

Patch 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-13332 Cisco NX-OS Software CLI Command Injection Vulnerability KEVCVSS 3.1MEDIUM 6.7
  • TI-2018-00260 Improper input validation in Cisco NX-OS unknown CVSS 3.0CRITICAL 9.8
  • TI-2019-01226 Cisco NX-OS Software Netstack Denial of Service Vulnerability CVSS 3.1HIGH 8.6
  • TI-2022-05183 Cisco NX-OS Software Cisco Fabric Services Over IP Denial of Service Vulnerability CVSS 3.1HIGH 8.6
  • TI-2022-05182 Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability CVSS 3.1HIGH 8.6
See all 274 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences