CVE-2025-20235: Cisco Firepower Management Center · Cross-site Scripting
Affects Cisco Firepower Management CenterSource CVE Database V5
Not known to be exploited · CVSS 6.1 Medium.
Data as of 26 Oct 2026, 06:26 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 14 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco Firepower Management Center | Affected
| Fixed in– |
AI-suggested
1. Immediate patching: Organizations should monitor Cisco's official advisories and apply patches or updates as soon as they become available for the affected FMC versions. 2. Input validation enhancements: Until patches are applied, implement web application firewalls (WAFs) or reverse proxies with rules designed to detect and block suspicious input patterns targeting the FMC interface. 3. Restrict access: Limit access to the FMC management interface to trusted networks and IP addresses using network segmentation and firewall rules to reduce exposure to unauthenticated remote attackers. 4. User training: Educate administrators on the risks of clicking unknown or suspicious links, especially when logged into the FMC interface, to reduce the likelihood of successful user interaction exploitation. 5. Multi-factor authentication (MFA): Although the vulnerability does not require authentication, enforcing MFA on the FMC interface can reduce the impact of session hijacking or credential theft. 6. Monitoring and logging: Enable detailed logging and monitor for unusual activity or access patterns on the FMC interface to detect potential exploitation attempts early. 7. Incident response readiness: Prepare incident response plans specific to FMC compromise scenarios to enable rapid containment and remediation if exploitation is detected.
Description
A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit this vulnerability by inserting crafted input into various data fields in an affected interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information.