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Command InjectionWeakness · CWE-77

CVE-2026-9434

CRITICAL · 9.8 CVSS v3.1 Published 2026-05-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A security vulnerability has been detected in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function setWiFiWpsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument wscDisabled leads to os command injection. The attack may be launched remotely. The exploit has been disclosed publicly 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 · high confidence

OS command injection vulnerability in Totolink A8000RU router's web management interface. The setWiFiWpsCfg function in /cgi-bin/cstecgi.cgi does not properly sanitize the wscDisabled parameter, allowing remote attackers to inject and execute arbitrary OS commands.

MitigationApply vendor firmware patch when available. Until then, restrict network access to the web management interface (port 80/443) to trusted IP addresses only, or disable remote administration entirely.

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Totolink A8000RU device
    Check the device model through the web management interface login page, router label, or network discovery tools such as nmap with service detection
    Affected if The device is a Totolink A8000RU router
  2. Verify web management interface accessibility
    Confirm the CGI endpoint exists by attempting to access http://<device-ip>/cgi-bin/cstecgi.cgi or checking if the page loads
    Affected if The /cgi-bin/cstecgi.cgi endpoint is accessible and responds
  3. Confirm WAN management is enabled
    Check router web interface under advanced settings or network configuration for 'remote management' or 'WAN access' settings. Look for options like 'Enable Web Management from WAN' or similar.
    Affected if WAN/remote web management is enabled, exposing the interface to untrusted networks
  4. Verify setWiFiWpsCfg function availability
    Send a POST request to /cgi-bin/cstecgi.cgi with a test payload targeting the setWiFiWpsCfg function (for example: topic=setWiFiWpsCfg with wscDisabled parameter). Use Burp Suite, curl, or similar to test.
    Affected if The setWiFiWpsCfg function accepts the wscDisabled parameter without sanitization, allowing command injection
  5. Check for indicators of compromise
    Review router system logs for unexpected command execution, new admin accounts, or unfamiliar processes. Monitor network traffic for outbound connections to suspicious IPs.
    Affected if Log entries show unauthorized command execution or unexpected configuration changes

A user is affected if they have a Totolink A8000RU router with WAN-accessible web management and the setWiFiWpsCfg function accepts unsanitized wscDisabled input.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware patch when available. Until then, restrict network access to the web management interface (port 80/443) to trusted IP addresses only, or disable remote administration entirely.

Recommended fix Moderate confidence

Latest available firmware for Totolink A8000RU (check www.totolink.net for version newer than 7.1cu.643_b20200521)

  1. 1. Identify the current firmware version of the Totolink A8000RU router by accessing the web management interface at http://192.168.0.1 and navigating to System > Firmware Upgrade or similar.
  2. 2. Navigate to the official Totolink support website at www.totolink.net and locate the downloads or support section for the A8000RU model.
  3. 3. Download the latest available firmware version for the A8000RU. Check the release notes or changelog for security fixes addressing CVE-2026-9434 or command injection vulnerabilities.
  4. 4. In the web management interface, access the firmware upgrade function (typically under System > Firmware Upgrade).
  5. 5. Upload the downloaded firmware file and allow the upgrade process to complete. Do not power off the device during this process.
  6. 6. After the router reboots, verify the new firmware version is installed and confirm the device is functioning normally.
  7. 7. If no newer firmware is available from Totolink, consider implementing network-level mitigations such as placing the device behind a firewall with restricted access, disabling remote management from WAN, or replacing the device with a model that has active security support.
Caveat Firmware upgrades on embedded devices can sometimes reset configuration to defaults; backup configuration before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing3.0 h
  • Review / QA2.0 h
17.0 hours of engineering $3,050
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-9434 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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