CVE-2020-3504: Cisco UCS Manager Software Local Management CLI Denial of Service Vulnerability

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-08-27 · updated 2026-06-17
Weakness: CWE-664

Description

A vulnerability in the local management (local-mgmt) CLI of Cisco UCS Manager Software could allow an authenticated, local attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of CLI command parameters. An attacker could exploit this vulnerability by executing specific commands on the local-mgmt CLI on an affected device. A successful exploit could allow the attacker to cause internal system processes to fail to terminate properly, which could result in a buildup of stuck processes and lead to slowness in accessing the UCS Manager CLI and web UI. A sustained attack may result in a restart of internal UCS Manager processes and a temporary loss of access to the UCS Manager CLI and web UI.

Affected products

Cisco Firepower Extensible Operating System (FXOS): all versions
Cisco NX-OS: from 4.0 before 4.0\(4i\) — fixed in 4.0\(4i\)

How to fix

Upgrade to a fixed version: Cisco NX-OS 4.0\(4i\). Check the vendor advisory for mitigations.

References

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