CVE-2015-4323

What it is

Buffer overflow in Cisco NX-OS on Nexus 1000V devices for VMware vSphere 7.3(0)ZN(0.9); Nexus 3000 devices 6.0(2)U5(1.41), 7.0(3)I2(0.373), and 7.3(0)ZN(0.83); Nexus 4000 devices 4.1(2)E1(1b); Nexus 7000 devices 6.2(14)S1; Nexus 9000 devices 7.3(0)ZN(0.9); and MDS 9000 devices 6.2 (13) and 7.1(0)ZN(91.99) and MDS SAN-OS 7.1(0)ZN(91.99) allows remote attackers to cause a denial of service (device outage) via a crafted ARP packet, related to incorrect MTU validation, aka Bug IDs CSCuv71933, CSCuv61341, CSCuv61321, CSCuu78074, CSCut37060, CSCuv61266, CSCuv61351, CSCuv61358, and CSCuv61366.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of service disruption.

Exploit odds

1.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2015-08-19 23:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:27 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.0% in the next 30 days (EPSS).
• Severity: 6.1 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2015-08-19 23:59 UTC

Last modified

2026-06-17 00:27 UTC

Exploit probability

1.0% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Cisco nx-os 6.2\(14\)s1
• Cisco nx-os 6.0\(2\)u5\(1.41\)
• Cisco nx-os 7.0\(3\)i2\(0.373\)
• Cisco nx-os 7.3\(0\)zn\(0.83\)
• Cisco nx-os 7.3\(0\)zn\(0.9\)
• Cisco Mds 9000 nx-os 6.2\(13\)
• Cisco Mds 9000 nx-os 7.1\(0\)zn\(91.99\)
• Cisco nx-os 4.1\(2\)e1\(1b\)

Attack profile CVSS 2.0 · 6.1

Attack vector

Adjacent network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

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