CVE-2019-1594

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

HIGH

7.4

CVSS Score

Published: March 6, 2019 at 10:00 PM UTC

Updated: June 17, 2026 at 02:28 AM UTC

12 products affected across 1 vendorNx OSNexus 9000 In Standalone Nx-Os ModeNexus 7000

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Severity

HIGH7.4

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS · Cisconpm

95%

v < 13.2(1l)v < 5.2(1)sv3(1.4b)v < 7.1(5)n1(1b)6.2 ≤ v < 6.2(20a)7.0(3)i7 ≤ v < 7.0(3)i7(4)7.2 ≤ v < 7.3(3)d1(1)7.2 ≤ v < 7.3(5)n1(1)8.0 ≤ v < 8.2(3)8.3 ≤ v < 8.3(1)

Affected range stops below 13.2(1l), so it looks safe — our inference, not a vendor statement

Affected range stops below 5.2(1)sv3(1.4b), so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2(20a), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)i7(4), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1(5)n1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(3)d1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)n1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.3(1), so it looks safe — our inference, not a vendor statement

cisco-nexus-1000v (environment) · cisco-nexus-2000 (environment) · cisco-nexus-3000 (environment) · cisco-nexus-3500 (environment) · cisco-nexus-5500 (environment) · cisco-nexus-5600 (environment) · cisco-nexus-6000 (environment) · cisco-nexus-7000 (environment) · cisco-nexus-7700 (environment) · cisco-nexus-9000 (environment) · cisco-nexus-9000-in-standalone-nx-os-mode (environment)

Nexus 1000V · Cisco

60%

v < 5.2(1)SV3(1.4b)

Affected range stops below 5.2(1)SV3(1.4b), so it looks safe — our inference, not a vendor statement

Nexus 2000 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 3000 · Cisco

60%

v < 7.0(3)I7(4)

Affected range stops below 7.0(3)I7(4), so it looks safe — our inference, not a vendor statement

Nexus 3500 · Cisco

60%

v < 7.0(3)I7(4)

Affected range stops below 7.0(3)I7(4), so it looks safe — our inference, not a vendor statement

Nexus 5500 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 5600 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 6000 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 7000 · Cisco

60%

v < 8.2(3)

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Nexus 7700 · Cisco

60%

v < 8.2(3)

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth

References (2)

VDB Entryx_refsource_BIDThird Party Advisory

Source: [email protected]

http://www.securityfocus.com/bid/107325

Vendor Advisoryx_refsource_CISCOPatch

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHcisco

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-264CWE-20

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