CVE-2023-41963
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 · uneditedDenial-of-service (DoS) vulnerability exists in FTP service of HMI GC-A2 series. If a remote unauthenticated attacker sends a specially crafted packets to specific ports, a denial-of-service (DoS) condition may occur.
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 denial-of-service vulnerability exists in the FTP service of HMI GC-A2 series devices. An unauthenticated remote attacker can send specially crafted packets to specific ports on the FTP service, causing the device to become unresponsive or crash.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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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Identify the device modelCheck the device label, web interface, or system information to confirm the exact model number is one of the affected GC-A2 series devices (GC A22w CW, GC A24w C(w), GC A26w C(w), GC A24, GC A24 M, GC A25, GC A26, or GC A26 J2).Affected if The device is any of the listed GC-A2 series models.
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Verify FTP service statusAccess the device management interface or use network scanning tools to determine if the FTP service is enabled and listening on the device. Check device configuration for FTP server settings.Affected if FTP service is enabled and running on the device.
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Check network accessibility of FTP portsScan the network for open FTP ports (typically port 21) on the device IP address. Determine if the device FTP service is reachable from untrusted or external networks.Affected if FTP ports are exposed to untrusted or internet-facing networks.
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Monitor device responsivenessAttempt to access the device web interface, ping the device, or connect to FTP to verify the device is responsive. Note any timeouts, failures, or unusually slow responses.Affected if The device is unresponsive, crashes, or exhibits degraded performance when accessing FTP or management interfaces.
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Review FTP service logsIf accessible, check device logs or syslog exports for errors, crashes, or abnormal FTP connection patterns around the time of suspected incidents.Affected if Logs show FTP service failures, restarts, or crash events.
A user is affected if they have a GC-A2 series device with FTP service enabled and the device or its FTP ports are accessible from networks where untrusted parties can send packets.
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 dataIsolate the HMI GC-A2 devices on a restricted network segment or behind a firewall to limit exposure to untrusted networks. If FTP is not required, disable the service. Apply vendor patches when available.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-41963 — 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-2023-41963 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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