Cisco fixed critical and high

A vulnerability in the change password functionality of Cisco Integrated Management Controller (IMC) could allow an unauthenticated, remote attacker to bypass authentication and gain access to the system as Admin. This vulnerability is due to incorrect handling of password change requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to bypass authentication, alter the passwords of any user on the system, including an Admin user, and gain access to the system as that user.

CVE-2026-20131 is a deserialization of untrusted data flaw (CWE-502) in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management. An unauthenticated, remote attacker can trigger it by sending crafted serialized data to the exposed management interface. Successful exploitation allows the attacker to execute arbitrary Java code as root on the affected device, giving full control of the central platform that manages Cisco firewall policy. Any organization running FMC or managing firewalls through SCC is potentially affected; specific version ranges have not yet been published in the available data. The flaw was added to CISA KEV on 2026-03-19 with known ransomware use, and EPSS assigns a ~31% probability of exploitation within 30 days (98th percentile), though no public proof-of-concept is known.

Do: Check Cisco's advisory for fixed releases and upgrade all FMC and SCC-managed deployments as soon as patched versions are identified, since version ranges are not yet in this data; until patched, restrict the FMC/SCC web-based management interface to trusted management networks or VPN access. Given the CISA KEV listing (added 2026-03-19) with known ransomware use, treat this as a high-priority patch and confirm whether BOD 22-01 remediation deadlines apply to your organization.

A vulnerability in Cisco Smart Software Manager On-Prem (SSM On-Prem) could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected SSM On-Prem host. This vulnerability is due to the unintentional exposure of an internal service. An attacker could exploit this vulnerability by sending a crafted request to the API of the exposed service. A successful exploit could allow the attacker to execute commands on the underlying operating system with root-level privileges.