CVE-2022-25136
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 command injection vulnerability in the function meshSlaveUpdate of TOTOLINK Technology routers T6 V3_Firmware T6_V3_V4.1.5cu.748_B20211015 and T10 V2_Firmware V4.1.8cu.5207_B20210320 allows attackers to execute arbitrary commands via a crafted MQTT packet.
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 confidenceA command injection vulnerability exists in the meshSlaveUpdate function of TOTOLINK T6 and T10 routers. Attackers can achieve remote code execution by sending crafted MQTT packets to the affected devices without authentication.
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 data= v4.1.5cu.748_b20211015= v4.1.8cu.5207_b20210320CVSS 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 device modelCheck the router label or web interface for the exact model number (T6 or T10)Affected if Device is not a Totolink T6 or T10 model - not affected
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Check firmware version on T6Access router web interface (usually 192.168.1.1) and navigate to Status or System menu to view firmware version, or check via CLI if availableAffected if Firmware version is NOT v4.1.5cu.748_b20211015 - not affected
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Check firmware version on T10Access router web interface (usually 192.168.1.1) and navigate to Status or System menu to view firmware version, or check via CLI if availableAffected if Firmware version is NOT v4.1.8cu.5207_b20210320 - not affected
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Verify MQTT service is enabledCheck router services or process list for MQTT daemon (port 1883 typically), or check router web interface for mesh/IoT service settingsAffected if MQTT service is disabled or not configured - vulnerability not exploitable
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Check network exposure of MQTT portScan the router IP for open port 1883 (MQTT) from external network or verify firewall allows MQTT traffic from untrusted networksAffected if MQTT port 1883 is exposed to untrusted networks - vulnerability is remotely exploitable
Device is affected only if it is a Totolink T6 running v4.1.5cu.748_b20211015 or T10 running v4.1.8cu.5207_b20210320, and MQTT service is enabled and accessible.
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 dataIf vendor firmware updates are available, apply them immediately to all affected T6 and T10 devices. If no patch exists, disable or restrict MQTT service access via firewall rules and place affected devices in isolated network segments.
- Consultation6.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-25136 — 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-2022-25136 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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