Secure Firewall Management CenterApplication · Cisco
CVE-2020-3302
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 authenticated, remote attacker to overwrite files on the file system of an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by uploading a crafted file to the web UI on an affected device. A successful exploit could allow the attacker to overwrite files on the file system of the affected device.
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 confidenceA file write vulnerability exists in the web UI of Cisco Firepower Management Center (FMC) Software due to insufficient input validation. An authenticated remote attacker can upload a crafted file through the web interface to overwrite arbitrary files on the device's file system. The attack requires valid authentication credentials but can be exploited remotely.
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
< 6.2.2.2CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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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Determine your FMC software versionAccess the Firepower Management Center web UI and navigate to the System > Updates page, or use the CLI and run 'show version' to retrieve the installed software versionAffected if The installed version is lower than 6.2.2.2 (for example, 6.2.2, 6.2.1, 6.2.0, or any 6.x release prior to 6.2.2.2)
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Verify if the FMC web UI is enabledConfirm that the web-based management interface is actively running and accessible on your FMC deviceAffected if The web UI is enabled and reachable on your network (the vulnerability is exploited through the web interface)
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Confirm authentication to the web UI is possibleCheck whether valid administrator credentials exist for FMC web access, or review your authentication configurationAffected if User accounts with web UI access privileges exist on the system (exploitation requires valid authentication credentials)
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Check for unauthorized file modificationsReview system logs and file integrity monitoring alerts for unexpected changes to configuration files, scripts, or system files that should not be writable via the web interfaceAffected if Unexpected files appear on the system or files have been modified outside of normal administrative actions
Your environment is affected if you are running any version of Cisco Secure Firewall Management Center below 6.2.2.2 and the web UI is accessible with valid credentials.
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 data6.2.2.2
Apply the Cisco security update when available. Until then, restrict access to the FMC web UI to only trusted administrators, ideally through network segmentation or VPN access, and monitor for suspicious file upload activity.
Fix this in Secure Firewall Management Center
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3302 — 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-2020-3302 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
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