CVE-2026-5849
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 determined in Tenda i12 1.0.0.11(3862). The impacted element is an unknown function of the component HTTP Handler. Executing a manipulation can lead to path traversal. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
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 confidenceA critical path traversal vulnerability exists in the HTTP Handler component of Tenda i12 router firmware version 1.0.0.11(3862). An unauthenticated remote attacker can manipulate HTTP requests to access files outside the web server's root directory, potentially exposing sensitive system files, configuration data, or credentials.
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= 1.0.0.11\(3862\)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 checksWork through these to decide whether this CVE applies to you.
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Identify the router modelAccess the router admin interface or check the device label to confirm it is a Tenda i12 routerAffected if The device is not a Tenda i12 model, then it is not affected by this specific CVE
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Check the installed firmware versionLog into the router admin panel and navigate to System Settings > Firmware Version, or use the Tenda firmware upgrade page to view the current versionAffected if The firmware version is exactly 1.0.0.11(3862), then it matches the affected version range
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Verify the HTTP handler service is activeCheck if the router web interface is accessible over HTTP/HTTPs on the LAN or WAN interface. Attempt to access the router login page via browser at the router's IP addressAffected if The HTTP service is disabled and not accessible, the path traversal cannot be exploited even on the affected firmware
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Test for path traversal vulnerability in HTTP requestsSend a crafted HTTP GET request to the router's web server with path traversal sequences such as /cgi-bin/../etc/passwd or /cgi-bin/../proc/version and observe the responseAffected if The HTTP handler returns file contents from outside the web root directory (sensitive system files), the vulnerability is confirmed present
A user is affected if they have a Tenda i12 router running firmware version 1.0.0.11(3862) with the HTTP handler service enabled and accessible, as demonstrated by successful path traversal responses.
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 dataImplement strict input validation and sanitization for all file path parameters in the HTTP handler. Use allowlist validation for permitted paths and canonicalize paths to prevent traversal sequences (../). Consider applying vendor firmware updates when available.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-5849 — 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-2026-5849 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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