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Command InjectionWeakness · CWE-77

CVE-2026-7155

CRITICAL · 9.8 CVSS v3.1 Published 2026-04-27
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. This impacts the function setLoginPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument admpass leads to os command injection. The attack may be initiated 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 CGI handler allows remote attackers to execute arbitrary OS commands via the admpass parameter in the setLoginPasswordCfg function of /cgi-bin/cstecgi.cgi.

MitigationApply vendor firmware patch when available; immediately restrict network access to the router's web interface to trusted IP addresses or disable remote administration to eliminate external attack surface.

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. Confirm Totolink A8000RU model
    Access the router web interface or check the device label/marketing materials to verify the exact model number is A8000RU
    Affected if The device is not a Totolink A8000RU router
  2. Verify CGI binary exists
    Attempt to access http://<router-ip>/cgi-bin/cstecgi.cgi or check if this endpoint responds to requests
    Affected if The /cgi-bin/cstecgi.cgi endpoint is accessible and responds
  3. Check if remote web management is enabled
    Log into the router admin panel and navigate to System > Administration or similar; look for remote access/enable web from WAN options
    Affected if Remote web management (HTTP/HTTPS from WAN) is enabled
  4. Confirm vulnerable function exists
    Send a request to the CGI endpoint with a modified adpass parameter; the vulnerability exists in the setLoginPasswordCfg function
    Affected if The setLoginPasswordCfg function handles the adpass parameter in cstecgi.cgi
  5. Review firmware version
    Check router admin panel for firmware version under System > Firmware or Status page
    Affected if Firmware is unpatched and the vendor has not released a fix for this specific command injection

The environment is affected if it is a Totolink A8000RU router with the cstecgi.cgi interface accessible remotely and the setLoginPasswordCfg function vulnerable to command injection via the adpass parameter.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware patch when available; immediately restrict network access to the router's web interface to trusted IP addresses or disable remote administration to eliminate external attack surface.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2026-7155 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data