CVE-2020-3553 Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities
Unauthenticated attackers can execute arbitrary scripts or access sensitive data via XSS in the Cisco FMC web interface by tricking users into clicking crafted links.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-3553?
CVE-2020-3553 is a medium-severity cross-site scripting vulnerability in Cisco Secure Firewall Management Center, published on 21 Oct 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2020-3553?
It affects 1 product.
Products include Cisco Secure Firewall Management Center.
How do I fix CVE-2020-3553?
No fix has been published for CVE-2020-3553 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-3553 being exploited?
There is no known exploitation of CVE-2020-3553 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Management Center
- CVE-2026-20079 Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel
- CVE-2026-20131 Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data
- CVE-2026-20316 Cisco Secure Firewall Management Center Use of Hard-coded Password
- CVE-2025-20265 Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability
- CVE-2024-20424 Command injection in Cisco Firepower Management Center
Sources
Also known as GHSA-3p47-g7f8-2ppg.