CVE-2017-8771
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 · uneditedOn BE126 WIFI repeater 1.0 devices, an attacker can log into telnet (which is open by default) with default credentials as root (username:"root" password:"root"). The attacker can make a user that is connected to the repeater click on a malicious link that will log into the telnet and will infect the device with malicious code.
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 confidenceThe BE126 WIFI repeater 1.0 ships with telnet service enabled using hardcoded default credentials (root/root). An attacker can exploit this by tricking connected users into visiting malicious links that automatically authenticate to telnet and deploy malicious code, achieving unauthenticated root-level access.
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 dataall versionsCVSS 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:3.0/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 model and firmware versionAccess the device admin interface or check the device label/marketing materials to confirm it is a BE126 WIFI repeater or Twsz Wifi Repeater. Note the firmware version if displayed.Affected if The device is a BE126 WIFI repeater or Twsz Wifi Repeater with any firmware version.
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Check if telnet service is accessibleUse a network scanner or run 'telnet <device-ip>' from a command line to probe if port 23 is open and responding on the device IP address.Affected if Port 23 (telnet) is open and accepting connections on the device.
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Verify default credentials are still activeAttempt to login via telnet using the credentials 'root' for both username and password. Observe if authentication succeeds.Affected if The credentials root/root successfully authenticate via telnet.
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Inspect for unauthorized processes or scriptsIf telnet access was obtained, run 'ps' or 'top' commands to list running processes. Check /tmp, /var, and /etc/init.d directories for unfamiliar scripts or binaries.Affected if Unexpected processes are running or suspicious scripts exist in system directories.
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Review network connections for indicators of compromiseRun 'netstat -an' or check router logs for outbound connections from the device to unknown external IPs, especially on unusual ports.Affected if The device has established connections to unexpected external hosts.
A defender is affected if they use a BE126 or Twsz Wifi Repeater and telnet with root/root credentials is accessible on their network.
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 dataChange the default telnet credentials immediately; if possible, disable the telnet service entirely or apply any available firmware update from the vendor.
- Consultation2.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,456.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-8771 — 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-2017-8771 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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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.
- 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