CVE-2025-6625
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 · uneditedCWE-20: Improper Input Validation vulnerability exists that could cause a Denial Of Service when specific crafted FTP command is sent to the 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 confidenceImproper input validation (CWE-20) in the FTP service allows remote attackers to send crafted FTP commands that cause a denial of service. The vulnerability stems from insufficient validation of input data in FTP command handling, leading to service disruption.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Confirm FTP service is runningUse system commands to list active network services (e.g., `netstat -tulpn` or `ss -tulpn`) and look for port 21/FTP listeners. On Linux, also check `/etc/services` for FTP port mapping and use `systemctl list-units --type=service` to find FTP daemon services.Affected if An FTP service daemon is actively listening on a network port
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Identify FTP server software and versionConnect to the FTP port (21/tcp) using a client or banner grabber (e.g., `nc -v <host> 21` or `telnet <host> 21`) and capture the server banner. If using an FTP client, the greeting message often reveals the software name and version.Affected if The FTP server version matches a known affected version or cannot be determined (unknown version)
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Check FTP service network exposureReview firewall rules (`iptables -L -n` or `firewall-cmd --list-all`) and network ACLs to determine if port 21 is accessible from external/untrusted IP addresses or the public internet.Affected if Port 21/FTP is open to untrusted networks or the internet without restrictive ACLs
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Verify FTP command handling configurationExamine the FTP server configuration file (e.g., `vsftpd.conf`, `proftpd.conf`, `wu-ftpd` settings in `/etc/`) for any non-standard command restrictions or logging configurations that might indicate command validation issues.Affected if The configuration allows anonymous or unrestricted FTP access
If an FTP service is running and accessible from untrusted networks, the environment may be affected by this vulnerability and should be monitored or mitigated until a patch is available.
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 dataApply vendor patches when available. Until then, restrict FTP access through firewall rules or network segmentation to minimize exposure to untrusted networks.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-6625 — 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-2025-6625 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
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