Secure Firewall Management CenterApplication · Cisco
CVE-2020-3313
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 UI 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 web-based management interface of the FMC Software. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit this vulnerability 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 to access 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 confidenceThis is a reflected Cross-Site Scripting (XSS) vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC). An unauthenticated, remote attacker can exploit insufficient input validation by tricking a user into clicking a crafted malicious link, allowing arbitrary JavaScript execution in the user's browser context or access to 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
< 6.2.2.3CVSS 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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Confirm Cisco FMC product installationIdentify if the system runs Cisco Firepower Management Center or Cisco Secure Firewall Management Center. Typically found via the FMC web UI header, or by running 'show version' on the device CLI and looking for 'Firepower' or 'FMC' in the output.Affected if The product is Cisco Firepower Management Center or Cisco Secure Firewall Management Center.
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Check FMC software versionLog into the FMC web interface and navigate to Help > About, or run 'show version' in the FMC CLI. Locate the displayed software version number.Affected if The installed version is lower than 6.2.2.3 (for example, 6.2.2, 6.2.1, 6.2.0, or earlier).
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Verify web management interface is enabledIn the FMC web UI, confirm the web-based management interface is active. Check under System > Configuration > Management Interface to see if HTTP/HTTPS management access is enabled.Affected if The web-based management interface is enabled and accessible.
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Assess network exposure of management interfaceReview network access lists or firewall rules to determine if the FMC web interface is reachable from untrusted networks or the internet. Check interface bindings for the management IP.Affected if The FMC web interface is exposed to untrusted networks or the internet without proper access restrictions.
A user is affected if they run Cisco Firepower/Secure Firewall Management Center with a version lower than 6.2.2.3 and have the web management interface enabled and accessible, particularly from networks where untrusted users could deliver malicious links.
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.
From vendor data6.2.2.3
Apply the Cisco patch/upgrade for FMC software as specified in the official Cisco security advisory. Users should be warned to avoid clicking untrusted links until the patch is applied.
Fix this in Secure Firewall Management Center
Scoped from the published advisory
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 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 $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3313 — 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-2020-3313 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
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