CVE-2020-3553: Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-21 · updated 2026-06-17
Weakness: CWE-79

Description

Multiple vulnerabilities in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. These vulnerabilities are due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information.

Affected products

Cisco Firepower Management Center: before 6.6.1 — fixed in 6.6.1

How to fix

Upgrade to a fixed version: Cisco Firepower Management Center 6.6.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-3553 or the next vulnerability affects your stack