Cisco Unified Computing System up to 6.0(1f) Web-based Management Interface/CLI os command injection

Summaryinfo

A vulnerability identified as critical has been detected in Cisco Unified Computing System. Affected is an unknown function of the component Web-based Management Interface/CLI. This manipulation causes os command injection. This vulnerability is tracked as CVE-2026-20036. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Cisco Unified Computing System. Affected by this vulnerability is some unknown functionality of the component Web-based Management Interface/CLI. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the CLI and web-based management interface of Cisco UCS Manager Software could allow an authenticated, remote attacker with valid administrative privileges to execute arbitrary commands on the underlying operating system of an affected device.    This vulnerability is due to insufficient input validation of command arguments that are supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to the affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.

The advisory is shared at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2026-20036 since 10/08/2025. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/28/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• Cisco

Name

• Unified Computing System

Version

• 4.0(1a)
• 4.0(1b)
• 4.0(1c)
• 4.0(1d)
• 4.0(2a)
• 4.0(2b)
• 4.0(2d)
• 4.0(2e)
• 4.0(4a)
• 4.0(4b)
• 4.0(4c)
• 4.0(4d)
• 4.0(4e)
• 4.0(4f)
• 4.0(4g)
• 4.0(4h)
• 4.0(4i)
• 4.0(4k)
• 4.0(4l)
• 4.0(4m)
• 4.0(4n)
• 4.0(4o)
• 4.1(1a)
• 4.1(1b)
• 4.1(1c)
• 4.1(1d)
• 4.1(1e)
• 4.1(2a)
• 4.1(2b)
• 4.1(2c)
• 4.1(3a)
• 4.1(3b)
• 4.1(3c)
• 4.1(3d)
• 4.1(3e)
• 4.1(3f)
• 4.1(3h)
• 4.1(3i)
• 4.1(3j)
• 4.1(3k)
• 4.1(3l)
• 4.1(3m)
• 4.1(3n)
• 4.1(4a)
• 4.2(1c)
• 4.2(1d)
• 4.2(1f)
• 4.2(1i)
• 4.2(1k)
• 4.2(1l)
• 4.2(1m)
• 4.2(1n)
• 4.2(2a)
• 4.2(2c)
• 4.2(2d)
• 4.2(2e)
• 4.2(3b)
• 4.2(3d)
• 4.2(3e)
• 4.2(3g)
• 4.2(3h)
• 4.2(3i)
• 4.2(3j)
• 4.2(3k)
• 4.2(3l)
• 4.2(3m)
• 4.2(3n)
• 4.2(3o)
• 4.2(3p)
• 4.3(2b)
• 4.3(2c)
• 4.3(2e)
• 4.3(2f)
• 4.3(3a)
• 4.3(3c)
• 4.3(4a)
• 4.3(4b)
• 4.3(4c)
• 4.3(4d)
• 4.3(4e)
• 4.3(4f)
• 4.3(5a)
• 4.3(5c)
• 4.3(5d)
• 4.3(5e)
• 4.3(6a)
• 4.3(6b)
• 4.3(6c)
• 4.3(6d)
• 4.3(6e)
• 6.0(1b)
• 6.0(1c)
• 6.0(1d)
• 6.0(1e)
• 6.0(1f)

License

• commercial

Website

• Vendor: https://www.cisco.com/

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