Cisco has revealed a severe vulnerability in its Integrated Management Controller (IMC) software, necessitating immediate software updates to protect affected systems.
Understanding the Cisco IMC Vulnerability
The security flaw, identified as CVE-2026-20093, has been assigned a critical Base CVSS score of 9.8, signifying an extremely high severity. The issue originates from improper processing of password change requests within the Cisco IMC software.
This vulnerability allows remote attackers to send specially crafted HTTP requests to compromised devices. Successfully exploiting this flaw enables attackers to bypass authentication processes, potentially allowing unauthorized access to user accounts, including the primary Admin account.
Impacted Devices and Hardware
Several Cisco hardware products are susceptible to this vulnerability if they operate on a compromised version of the Cisco IMC software. Notably, affected standalone products include the 5000 Series Enterprise Network Compute Systems (ENCS), Catalyst 8300 Series Edge uCPE, and UCS C-Series M5 and M6 Rack Servers in standalone mode, among others.
Additionally, various Cisco appliances relying on preconfigured versions of the vulnerable UCS C-Series Servers are at risk, especially if their IMC interface is exposed. This encompasses devices like Application Policy Infrastructure Controller (APIC) Servers, Catalyst Center Appliances, and Secure Firewall Management Center Appliances.
Recommended Actions and Future Security Measures
Currently, there are no temporary fixes or mitigations available to counter this vulnerability. Cisco strongly advises applying the official software updates to secure affected systems. Administrators should promptly upgrade their systems to the patched software versions provided by Cisco.
For systems such as the 5000 Series ENCS and Catalyst 8300 Series, upgrading the underlying Cisco Enterprise NFV Infrastructure Software (NFVIS) is necessary. Standalone servers can utilize the Cisco Host Upgrade Utility (HUU) to perform the necessary updates to the IMC software.
While Cisco has acknowledged a security researcher for uncovering this flaw, there is no current evidence suggesting active exploitation or public disclosure of malicious activity related to this vulnerability.
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