Secure Firewall Management CenterApplication · Cisco
CVE-2023-20206
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 · uneditedMultiple vulnerabilities in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface of an affected device. These vulnerabilities are due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit these vulnerabilities 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. In some cases, it is also possible to cause a temporary availability impact to portions of the FMC Dashboard.
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 · moderate confidenceMultiple stored XSS vulnerabilities exist in Cisco Firepower Management Center's web-based management interface due to insufficient validation of user-supplied input. An unauthenticated remote attacker can inject malicious scripts into data fields, which are then stored and executed in the context of other users' browsers when they access the affected interface, potentially allowing access to sensitive browser-based information or causing temporary dashboard availability impacts.
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
>= 6.6.0, <= 6.6.7.1>= 6.7.0, <= 6.7.0.3>= 7.0.0, <= 7.0.5>= 7.1.0, <= 7.1.0.3>= 7.2.0, <= 7.2.4>= 7.3.0, <= 7.3.1.1CVSS 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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Identify Cisco FMC product and versionAccess the Firepower Management Center web interface and navigate to Help > About, or log into the device CLI and run 'show version' to determine the exact software versionAffected if The installed version falls within these ranges: 6.6.0 to 6.6.7.1, 6.7.0 to 6.7.0.3, 7.0.0 to 7.0.5, 7.1.0 to 7.1.0.3, 7.2.0 to 7.2.4, or 7.3.0 to 7.3.1.1
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Verify web management interface exposureConfirm whether the FMC web-based management interface is accessible from network segments that include untrusted or external usersAffected if The management interface is reachable by unauthenticated or untrusted users on the network
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Inspect stored data fields for injected scriptsReview dashboard widgets, saved policies, object definitions, and configuration fields within the FMC web interface for unexpected script tags, encoded characters, or suspicious content that does not belong to your legitimate configurationAffected if Any stored data fields contain malicious script payloads that could be executed in other users' browser sessions
Your environment is affected if the FMC version is within the listed ranges AND the web management interface is accessible to untrusted users, allowing potential injection of malicious scripts into stored data fields.
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 · scopedApply the appropriate Cisco software update for FMC when available; in the interim, restrict network access to the management interface to trusted users only and monitor for suspicious input patterns in data fields.
Upgrade to FMC version 7.1.0.4 or later, or 7.2.x/7.3.x (latest stable release) - Cisco has released fixed versions beyond the affected branches (7.1.0.3 and earlier)
- 1. Identify the current version of Secure Firewall Management Center by navigating to the FMC web interface and checking the System > Updates page or the dashboard for version information.
- 2. Determine which version branch (6.6.x, 6.7.x, 7.0.x, or 7.1.x) your current installation is running on.
- 3. Download the appropriate fixed FMC software version from the Cisco Software Download center (software.cisco.com) or your Cisco smart account.
- 4. Plan for a maintenance window as the upgrade will require downtime; schedule accordingly.
- 5. Back up the FMC configuration before proceeding with the upgrade.
- 6. Install the upgraded FMC software version using the web-based management interface or CLI, following Cisco's upgrade procedure documentation.
- 7. After upgrade, verify the new version is installed and confirm the CVE-2023-20206 vulnerability is resolved by checking the Cisco Security Advisory.
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Secure Firewall Management Center
Scoped from the published advisory
- Consultation4.0 h
- Implementation4.0 h
- Testing6.0 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 $4,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20206 — 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-2023-20206 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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- Version or environment caveats, and links to real fixes
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