CVE-2026-7203
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 was found in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument enable results in os command injection. The attack can be launched remotely. The exploit has been made public and could 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 · high confidenceOS command injection vulnerability in Totolink A8000RU router firmware (7.1cu.643_b20200521). The setUrlFilterRules function in /cgi-bin/cstecgi.cgi does not properly sanitize the 'enable' argument before passing it to system shell, allowing remote authenticated attackers to execute arbitrary OS commands.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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 modelAccess the router web interface or check the device label to confirm it is a Totolink A8000RU routerAffected if The device is not a Totolink A8000RU router, then this specific CVE does not apply
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Check the firmware versionIn the router web interface, navigate to System Status or Firmware Upgrade page to view the current firmware version. Compare it to 7.1cu.643_b20200521Affected if The installed firmware version matches or predates 7.1cu.643_b20200521, indicating it may contain the vulnerable code
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Verify the vulnerable CGI binary existsAccess the router and confirm the file /cgi-bin/cstecgi.cgi exists on the device firmware or web serverAffected if The file /cgi-bin/cstecgi.cgi is present and corresponds to the firmware version in step 2
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Confirm URL Filter feature is accessibleCheck if the router web interface exposes URL filtering or parental control settings that invoke the setUrlFilterRules functionAffected if The URL filter or parental control feature is present and uses the cstecgi.cgi endpoint with the enable parameter
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Test for command injection in the enable parameterSend a crafted HTTP request to /cgi-bin/cstecgi.cgi with the setUrlFilterRules action and a specially crafted enable parameter containing shell metacharacters (only in an authorized, isolated test environment)Affected if The enable parameter accepts and executes arbitrary shell commands without proper sanitization
The device is affected if it is a Totolink A8000RU running firmware version 7.1cu.643_b20200521 or earlier, with the cstecgi.cgi binary present and the URL filter feature enabled.
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 dataCheck vendor for firmware updates; if unavailable, disable remote web management from WAN, block external access to port 80/443, or consider replacing the device.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-7203 — 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-2026-7203 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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