Multiple vulnerabilities have been discovered in the web-based management interface of Cisco Firepower Management Center (FMC) Software. These vulnerabilities could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface, potentially compromising sensitive data or causing temporary availability interruption on parts of the FMC Dashboard.

Original References

- Cisco Security Advisory:
- CVE:

Vulnerability Details

These vulnerabilities are caused by insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit these vulnerabilities by inserting specially crafted input into various data fields in the affected interface. A successful exploit would enable an attacker to execute arbitrary script code within the context of the interface, or access sensitive browser-based information.

In some cases, exploiting these vulnerabilities could also cause a temporary availability impact to sections of the FMC Dashboard. However, this impact would usually be resolved automatically without the need for manual intervention.

Attack Scenario (code snippet)

The following code snippet demonstrates a crafted input that an attacker could insert into a vulnerable data field of the FMC interface:

  // Malicious JavaScript code here
  alert('XSS Attack');

Upon inserting this crafted input, any user who visits the affected page of the FMC web-based management interface would be subject to the stored XSS attack, potentially compromising their sensitive data or causing temporary disruption of the FMC Dashboard.

Cisco Firepower Management Center Virtual Appliance

Software releases 6.7. and earlier for these products are affected.

Mitigations and Recommendations

Cisco has released software updates to address these vulnerabilities. Users are advised to upgrade to the latest version of FMC Software to protect their device from potential attacks. It is also recommended to follow the documented Cisco guidelines for secure configuration and restrict administrative access to trusted users and networks.


The CVE-2022-20834 vulnerabilities in the web-based interface of Cisco FMC Software present a potential security risk to users. If left unpatched, these vulnerabilities could enable an authenticated, remote attacker to execute arbitrary script code, access sensitive information, or cause temporary availability impacts. It is crucial for administrators to apply the appropriate software updates and follow best practices to protect their systems from these vulnerabilities.


Published on: 11/15/2022 21:15:00 UTC
Last modified on: 11/18/2022 18:14:00 UTC