Cisco License (Smart Software Manager) On-Prem Vulnerabilities

Description

Multiple vulnerabilities in the web-based management interface and API endpoints of Cisco License On-Prem, formerly Cisco Smart Software Manager On-Prem (SSM On-Prem), could allow a remote attacker to gain unauthorized access, access sensitive information, cause a denial of service (DoS) condition, or elevate privileges. For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssm-access-nttb2dhE For further documentation of improvements and fixes in Cisco License On-Prem, see Cisco License (Smart Software Manager) On-Prem Security Hardening Release . Security Impact Rating: Critical CVE: CVE-2026-20328,CVE-2026-76437,CVE-2026-76452,CVE-2026-76454

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Cisco

Product

Cisco License On-Prem (SSM On-Prem)

CVE

CVE-2026-20328, CVE-2026-76437, CVE-2026-76452, CVE-2026-76454

CVSS score

9.1

Actively exploited

Not known at this time

Source

Cisco PSIRT – original advisory

Published

October 7, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.