CVE-2023-28769
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 · uneditedThe buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable 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 · high confidenceA buffer overflow vulnerability exists in the libclinkc.so library of the zhttpd web server in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0, allowing remote unauthenticated attackers to execute arbitrary OS commands or cause denial-of-service conditions.
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< 5.17\(abyo.1\)c0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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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Confirm device modelAccess the device administration interface or check the device label to verify the model is Zyxel DX5401-B0Affected if Device is not a Zyxel DX5401-B0 model (different models may have different vulnerability status)
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Identify firmware versionCheck the device firmware version through the web interface under Status or System Info, or via CLI command that displays firmware versionAffected if Firmware version is lower than V5.17(ABYO.1)C0 (versions prior to this threshold are affected)
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Verify zhttpd service statusCheck if the zhttpd web server is running on the device (typically via CLI command like 'ps' or through the web interface service status)Affected if zhttpd service is active (the vulnerability exists in this web server component)
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Confirm libclinkc.so presenceLocate the libclinkc.so library file on the device filesystem, typically within the zhttpd installation directoryAffected if The libclinkc.so library file exists on the device (the vulnerable library is present)
A user is affected if they have a Zyxel DX5401-B0 device running firmware versions prior to V5.17(ABYO.1)C0 with the zhttpd web server and its libclinkc.so library active.
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.
dbcve · scoped5.17
Update Zyxel DX5401-B0 firmware to version V5.17(ABYO.1)C0 or later to remediate the vulnerability.
V5.17(ABYO.1)C0 or later
- 1. Identify the current firmware version of the Zyxel DX5401-B0 device
- 2. Download the latest firmware version V5.17(ABYO.1)C0 or later from the official Zyxel support website (www.zyxel.com)
- 3. Access the device's web management interface or use the Zyxel firmware upgrade mechanism
- 4. Upload and apply the firmware update to the device
- 5. Verify the firmware upgrade was successful and the device is functioning properly
- 6. Confirm the device is now running firmware version V5.17(ABYO.1)C0 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-28769 — 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-2023-28769 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
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