CVE-2025-6621
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 vulnerability classified as critical has been found in TOTOLINK CA300-PoE 6.2c.884. This affects the function QuickSetting of the file ap.so. The manipulation of the argument hour/minute leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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 confidenceOS command injection in TOTOLINK CA300-PoE router firmware (v6.2c.884) allows remote attackers to execute arbitrary commands via unsanitized hour/minute parameters passed to the QuickSetting function in the ap.so library.
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= 6.2c.884CVSS 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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Identify the device modelLog into the router administrative interface or check the device label to confirm the model is TOTOLINK CA300-PoEAffected if The device is not a TOTOLINK CA300-PoE router, the vulnerability does not apply
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Check the firmware versionNavigate to the router's web interface (typically at 192.168.1.1) and locate the firmware version in System or Administration settings, or use the command line and run 'cat /proc/version' or check /etc/version file if accessible via telnet/sshAffected if The installed firmware version is 6.2c.884
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Verify the ap.so component existsIf you have telnet or SSH access to the device, run 'ls -la /lib/httpd/ap.so' or search for the ap.so file in the /lib/httpd/ directoryAffected if The ap.so component is present on the device and the QuickSetting function is accessible
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Confirm remote management is exposedCheck the router's firewall or port forwarding settings to determine if the web management interface (HTTP/HTTPS on ports 80/443) is accessible from the WAN/internet, or review access control lists in the firewall configurationAffected if Remote management interfaces are exposed to untrusted networks, the attack can be launched remotely
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Look for indicators of compromiseReview router system logs for unexpected commands, unusual HTTP requests to the QuickSetting function, or unauthorized configuration changes. Check for new user accounts or unexpected processes running as rootAffected if Log entries show suspicious commands, unexpected POST requests to QuickSetting, or unauthorized administrative activity
You are affected if you have a TOTOLINK CA300-PoE router running firmware version 6.2c.884 with the ap.so component present and remote management exposed to 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 dataApply vendor firmware patch if available; otherwise restrict management interface to trusted networks or disable remote administration to reduce attack surface.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-6621 — 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-2025-6621 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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