CVE-2021-25306
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 · uneditedA buffer overflow vulnerability in the AT command interface of Gigaset DX600A v41.00-175 devices allows remote attackers to force a device reboot by sending relatively long AT commands.
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 AT command interface of Gigaset DX600A v41.00-175 devices. By sending unusually long AT commands, remote attackers can trigger the overflow, causing an uncontrolled device reboot.
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= v41.00-175CVSS 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 modelLocate the physical device or check network inventory for Gigaset DX600A base station. The device model is usually printed on the device casing or accessible via web interface at the device's IP address.Affected if Device is a Gigaset DX600A base station
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Check the installed firmware versionAccess the device's web管理界面 (typically via browser at the device's IP address) and navigate to the status or system information page to view the firmware version. Alternatively, check device documentation or the admin panel for firmware version information.Affected if Firmware version is exactly v41.00-175
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Determine if the AT command interface is network-accessibleCheck if the device has an exposed network service that accepts AT commands. This may be via telnet (port 23) or a proprietary management protocol. Scan the device IP for open ports, particularly telnet or custom ports that might process AT commands.Affected if AT command interface is exposed over the network (telnet or other network service accepting AT commands)
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Verify network accessibility of the management interfaceConfirm whether the device management interface is reachable from untrusted networks. Check router/firewall rules and network segmentation to see if the device is directly accessible from the internet or from less-trusted network segments.Affected if Device management interface is accessible from untrusted networks or the internet
A user is affected if they have a Gigaset DX600A device running firmware version v41.00-175 with an exposed AT command interface reachable from the network.
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 dataIf available, apply vendor firmware updates. Otherwise, restrict network access to the device's management interface or isolate the device on a separate network segment to reduce exposure.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25306 — 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-2021-25306 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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