CVE-2025-5436
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 Multilaser Sirius RE016 MLT1.0. It has been rated as problematic. This issue affects some unknown processing of the file /cgi-bin/cstecgi.cgi. The manipulation leads to information disclosure. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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 confidenceAn information disclosure vulnerability exists in the /cgi-bin/cstecgi.cgi CGI binary of the Multilaser Sirius RE016 router firmware. The issue allows remote attackers to potentially access sensitive information through manipulated requests to this CGI endpoint. The exploit has been publicly disclosed.
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
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 admin interface or check the device label to confirm the model is Multilaser Sirius RE016Affected if Device model is Multilaser Sirius RE016
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Locate the CGI endpointCheck if the file /cgi-bin/cstecgi.cgi exists on the device by attempting to access it via HTTP or HTTPS from the local networkAffected if The endpoint responds or is present on the device
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Determine if remote access is enabledIn the router admin interface, check the remote management or remote administration settings to see if access to the CGI binary is allowed from external IPsAffected if Remote management is enabled and the CGI endpoint is reachable from outside the local network
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Verify firmware versionIn the router admin interface, look for a firmware version or build number in the status or system settings pageAffected if Firmware version matches the affected version range (if known) or cannot be determined/patched by the vendor
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Test endpoint for information disclosureSend a crafted HTTP GET or POST request to /cgi-bin/cstecgi.cgi with minimal or manipulated parameters from the local network to observe if sensitive data is returnedAffected if The endpoint returns sensitive information such as credentials, configuration data, or system details in response to manipulated requests
The device is affected if it is a Multilaser Sirius RE016 router with the /cgi-bin/cstecgi.cgi endpoint accessible, particularly if remote management is enabled or the firmware cannot be verified as patched.
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 dataSince the vendor did not respond to the disclosure, apply compensating controls: restrict network access to the device's management interface, disable remote administration if possible, or replace the device with a supported alternative.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-5436 — 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-2025-5436 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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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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