CVE-2026-31177
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 · uneditedAn issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.
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 confidenceCommand injection vulnerability in ToToLink A3300R router firmware v17.0.0cu.557_B20221024 allows unauthenticated attackers to execute arbitrary OS commands via the stunMinAlive parameter in the /cgi-bin/cstecgi.cgi endpoint. This is a classic input validation flaw where user-supplied data is passed to a system shell without proper sanitization.
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= 17.0.0cu.557_b20221024CVSS 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 device modelAccess the router's web management interface or check the device label/marketing to confirm it is a ToToLink A3300R model.Affected if The device is not a ToToLink A3300R router.
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Check firmware versionLog into the router web interface and navigate to the status or system information page to view the installed firmware version, or use the router's upgrade/check mechanism.Affected if The installed firmware version is 17.0.0cu.557_B20221024.
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Verify web management interface is accessibleAttempt to access the router's web interface over HTTP/HTTPS from a network-connected host by entering the router's IP address in a browser.Affected if The web management interface responds and is reachable from your network.
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Check if vulnerable endpoint is presentSend a request to http://<router-ip>/cgi-bin/cstecgi.cgi and observe if the endpoint responds (even with an error).Affected if The /cgi-bin/cstecgi.cgi endpoint is reachable and responds to requests.
You are affected if the device is a ToToLink A3300R running firmware version 17.0.0cu.557_B20221024 and the web management interface (cstecgi.cgi) is 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 firmware update when available; until then, disable or restrict access to the web management interface (cstecgi.cgi) via network ACLs or firewall rules to prevent unauthenticated external access.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-31177 — 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-2026-31177 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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