In plain language
What this advisory means
A security flaw in Cisco Secure Firewall Management Center software lets attackers log in remotely without needing to authenticate, using a built-in low-privileged account. This access can expose sensitive system data. While the account limits access rights, the vulnerability still poses significant risk, especially combined with other flaws that might allow attackers to gain higher privileges. Cisco warns that this threat is serious and recommends updating the software to fix it, as no temporary workarounds exist. Limiting public internet exposure of the management interface can reduce risk.
Technical explanation
How the issue affects the environment
The vulnerability arises from static credentials embedded in a low-privileged account within the web interface of Cisco Secure Firewall Management Center (FMC) Software. An unauthenticated remote attacker can exploit these hardcoded credentials to log into the FMC system as a low-privileged user, thus gaining access to sensitive data stored or processed by the system. While direct privilege escalation is not inherent to this flaw, Cisco has rated the impact as High because this vulnerability can be chained with other FMC vulnerabilities to elevate privileges further. The vulnerability affects all configurations of Cisco Secure FMC Software. Cisco has released specific hotfixes across multiple software versions to remove this static credential exposure. No workarounds effectively mitigate this risk. Exposure is reduced if the FMC management interface lacks public internet access.
Operational impact
Why teams should care
If exploited, this vulnerability permits remote attackers to access confidential information on Cisco Secure FMC devices using pre-set low-privilege account credentials. While attackers cannot directly escalate privileges through this flaw alone, combining it with other vulnerabilities can lead to full system compromise. This represents a significant risk to organizations relying on Cisco FMC for firewall management, potentially leading to data breaches or operational disruptions. The lack of available workarounds means timely software upgrades are critical to mitigate this risk and ensure continued secure operations.
Immediate action
Cisco strongly recommends all customers to apply the provided hotfixes specific to their FMC software version to fully remediate the vulnerability. These hotfixes remove the static credentials and prevent unauthorized login. Upgrading to the latest fixed software release is the only reliable way to secure the system against this flaw. Customers should use Cisco's Software Center or contact Cisco TAC for assistance in obtaining and installing the appropriate updates. Monitoring logs for specified indicators can help identify exploitation attempts.
Affected and fixed releases
Temporary risk reduction
There are no workarounds available that effectively mitigate this vulnerability. Reducing the attack surface by limiting access to the FMC management interface from the public internet can lower the risk but does not eliminate it. Full remediation requires applying Cisco's hotfixes.
Evidence and validation checklist
- Cisco official security advisory URL: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-static-cred-BET3Cjh
- CVE identifier: CVE-2026-20316
- Cisco assigned Security Impact Rating of High
- Presence of static credentials in FMC web interface
- No effective workarounds available
- Active exploitation reported by Cisco PSIRT in July 2026
- Details on hotfixes for multiple versions provided
- CLI command to detect potential exploitation indicators
Authoritative reference
Cisco PSIRT Advisories
QCS detected and normalized this record from the official source. Vendor guidance remains authoritative.