CVE-2022-25134
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 setUpgradeFW of TOTOLINK Technology router T6 V3_Firmware T6_V3_V4.1.5cu.748_B20211015 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 setUpgradeFW function of TOTOLINK T6 router firmware. Attackers can execute arbitrary commands by sending crafted MQTT packets to the vulnerable function, which fails to properly sanitize input before passing it to system shell execution. This results in full remote code execution with the privileges of the firmware service.
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_b20211015CVSS 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 the router modelAccess the router's web admin interface (typically at 192.168.0.1 or 192.168.1.1) and check the device information page, or inspect the physical device labelAffected if The device is not a TOTOLINK T6 router (not affected)
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Check the installed firmware versionIn the router admin interface, navigate to System or Status settings to view the firmware version. Alternatively, if you have telnet/ssh access, run `nvram get firmver` or check `/etc/version`Affected if The firmware version is exactly v4.1.5cu.748_b20211015 (only this specific version is affected)
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Verify if MQTT service is enabledIn the router admin interface, look for MQTT-related settings under Advanced, Network, or Services sections. If you have shell access, check for the MQTT daemon process or examine init scripts for MQTT startupAffected if MQTT service is running or enabled on the device - this is required for the attack vector
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Confirm network accessibility of management interfaceCheck the router's firewall rules or WAN access settings to determine if the admin interface is exposed to external networks. Attempt to access the router's web interface from outside your local network (if safe to do so)Affected if The router's management interface is accessible from WAN (external network), making it exploitable via the MQTT attack vector
You are affected only if you have a TOTOLINK T6 router with firmware version v4.1.5cu.748_b20211015 AND the MQTT service is enabled and accessible (either locally or remotely depending on your network posture).
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 dataApply vendor-supplied firmware patch when available; until then, restrict network access to the router's management interface and disable MQTT service if not required, as the attack vector involves externally sent MQTT packets.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-25134 — 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-2022-25134 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
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