CVE-2023-5246
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 · uneditedAuthentication Bypass by Capture-replay in SICK Flexi Soft Gateways with Partnumbers 1044073, 1127717, 1130282, 1044074, 1121597, 1099832, 1051432, 1127487, 1069070, 1112296, 1044072, 1121596, 1099830 allows an unauthenticated remote attacker to potentially impact the availability, integrity and confidentiality of the gateways via an authentication bypass by capture-replay.
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 confidenceAuthentication bypass by capture-replay in SICK Flexi Soft Gateways allows an unauthenticated remote attacker to capture and replay valid authentication sequences to gain unauthorized access to the affected devices, potentially impacting confidentiality, integrity, and availability.
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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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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Identify the device modelAccess the device web interface, check the device name/model in the admin dashboard, or use network discovery to identify SICK Flexi Soft Gateway devices on the networkAffected if The device is any SICK Flexi Soft Gateway model (Fx0 Gent, Get, or Gmod series)
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Determine the installed firmware versionLog into the device web interface and navigate to System Information or firmware settings to view the current firmware version; alternatively, check the device configuration files or use the manufacturer's diagnostic toolAffected if The firmware version matches one of the affected variants: Gent00000, Gent00010, Gent00030, Get00000, Get00010, Gmod00000, Gmod00010, or Gmod00030 (all versions of these variants)
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Verify network exposure of the authentication interfaceScan network ports on the device to identify if HTTP/HTTPS management interfaces or API endpoints are exposed to untrusted networks; check firewall rules and access control lists surrounding the deviceAffected if The device management interface or authentication endpoints are reachable from untrusted network segments or the internet
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Inspect authentication traffic for replay vulnerabilityCapture network traffic on the segment between client and gateway during authentication using a packet sniffer; examine whether the authentication sequence uses static tokens or predictable session identifiers that could be captured and reusedAffected if The authentication mechanism uses replayable credentials or session tokens without anti-replay protections such as timestamps, nonces, or one-time passwords
You are affected if you have any SICK Flexi Soft Gateway (Fx0 series) deployed with firmware variants Gent00000, Gent00010, Gent00030, Get00000, Get00010, Gmod00000, Gmod00010, or Gmod00030, especially if the management interface is accessible from untrusted networks.
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 dataUpdate gateway firmware to a patched version if available; if no patch exists, implement network segmentation and additional authentication layers (e.g., VPN, multi-factor authentication) to mitigate capture-replay attack vectors.
- Consultation8.0 h
- Implementation16.0 h
- Testing8.0 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 $10,240.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-5246 — 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-2023-5246 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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