CVE-2023-21406
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 · uneditedAriel Harush and Roy Hodir from OTORIO have found a flaw in the AXIS A1001 when communicating over OSDP. A heap-based buffer overflow was found in the pacsiod process which is handling the OSDP communication allowing to write outside of the allocated buffer. By appending invalid data to an OSDP message it was possible to write data beyond the heap allocated buffer. The data written outside the buffer could be used to execute arbitrary code. lease refer to the Axis security advisory for more information, mitigation and affected products and software versions.
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 heap-based buffer overflow vulnerability in the pacsiod process of AXIS A1001 network controllers allows remote attackers to write data beyond the boundaries of heap-allocated buffers during OSDP (Open Supervised Device Protocol) communication. By appending invalid data to OSDP messages, an attacker can trigger the overflow and potentially achieve arbitrary code execution.
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<= 1.65.4CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/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 model is Axis A1001Access the device web interface or use network discovery to identify the exact model number of the Axis device. Look for 'A1001' in the device identification.Affected if The device is not an Axis A1001 controller, then it is not affected by this specific CVE.
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Check installed firmware versionLog into the Axis device web interface and navigate to the System > About or Settings > Maintenance page to view the current firmware version. Alternatively, use the Axis API or device discovery tool to query the firmware version.Affected if Firmware version is 1.65.4 or lower, meaning the device falls within the affected version range.
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Verify OSDP protocol is enabledAccess the device configuration through the web interface and check the OSDP (Open Supervised Device Protocol) settings. Look for OSDP-related configuration sections under Security, Access Control, or Hardware settings.Affected if OSDP communication is enabled and configured on the device, making the vulnerable pacsiod process active.
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Check network accessibility of OSDP serviceScan the network to identify open ports associated with OSDP communication (typically port 2000-2001 or vendor-specific ports). Verify if the device OSDP ports are exposed to untrusted networks.Affected if The OSDP service port is reachable from outside the trusted network, increasing exposure to remote attack vectors.
A user is affected if they have an Axis A1001 device running firmware version 1.65.4 or lower with OSDP protocol enabled and accessible.
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-supplied firmware updates from Axis for the A1001 device. Until patches are available, restrict network access to the device's OSDP communication ports and monitor for suspicious OSDP traffic patterns.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2023-21406 — 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-2023-21406 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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