Secure Firewall Management CenterApplication · Cisco
CVE-2022-20740
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability 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 attack. This vulnerability is due to improper validation of user-supplied input to the web-based management interface. An attacker could exploit this vulnerability by convincing a user to click a link designed to pass malicious input to the interface. A successful exploit could allow the attacker to conduct cross-site scripting attacks and gain access to sensitive browser-based information.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCross-site scripting (XSS) vulnerability in Cisco Firepower Management Center web-based management interface due to improper validation of user-supplied input. An unauthenticated remote attacker can exploit this by tricking a user into clicking a malicious link, enabling XSS attacks to access sensitive browser-based information.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Secure Firewall Management CenterApplication
< 6.6.5.2>= 6.7.0, < 7.0.2>= 7.1.0, < 7.1.0.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check FMC version via web interfaceLog into the Firepower Management Center web console and navigate to Help > About or System > Configuration to view the installed software versionAffected if The displayed version is less than 6.6.5.2, OR is 6.7.0 or higher but less than 7.0.2, OR is 7.1.0 or higher but less than 7.1.0.1
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Check FMC version via CLIAccess the FMC command-line interface and run the command to display the system version (such as 'show version' or the system-specific equivalent)Affected if The displayed version falls within one of the affected version ranges: < 6.6.5.2, >= 6.7.0 and < 7.0.2, or >= 7.1.0 and < 7.1.0.1
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Verify web management interface is enabledConfirm that the FMC web-based management interface is accessible on the network (typically ports 443 or 8443)Affected if The web management interface is exposed and the installed version is in the affected ranges
The environment is affected if the Cisco Secure Firewall Management Center is running any version within the specified vulnerable ranges and the web management interface is accessible to users.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped6.6.5.27.0.27.1.0.1
Apply the Cisco security patch for FMC when available. Additionally, implement URL filtering and user awareness training to reduce the risk of users clicking malicious links.
Upgrade to FMC version 6.6.5.2, 7.0.2, or 7.1.0.1 or later depending on your current branch
- 1. Identify the current installed version of Cisco Firepower Management Center via the web UI (System > About) or CLI (show version)
- 2. Review the Cisco Security Advisory (cisco-sa-fmc-xss) on tools.cisco.com for complete fixed version information
- 3. Ensure you have a complete backup of the FMC configuration before proceeding
- 4. Download the appropriate fixed software version (6.6.5.2+, 7.0.2+, or 7.1.0.1+) from Cisco Software Central
- 5. Schedule a maintenance window as FMC upgrades may cause temporary service disruption
- 6. Follow the FMC upgrade procedure documented in the Cisco Firepower Management Center Configuration Guide
- 7. After upgrade, verify the new version is installed and validate that the web interface functions correctly
- 8. Confirm the vulnerability is remediated by checking that user input is now properly validated in the affected interface areas
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Secure Firewall Management Center
Scoped from the published advisory
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-20740 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-20740 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data