CVE-2026-2877
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 has been found in Tenda A18 15.13.07.13. This affects the function strcpy of the file /goform/WifiExtraSet of the component Httpd Service. The manipulation of the argument wpapsk_crypto5g leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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 stack-based buffer overflow vulnerability exists in Tenda A18 router firmware version 15.13.07.13 within the Httpd service's /goform/WifiExtraSet function. The strcpy function copies the wpapsk_crypto5g parameter to a stack buffer without length validation, allowing remote attackers to overwrite stack memory and potentially execute arbitrary code.
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= 15.13.07.13CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 Tenda A18 device modelAccess the device's web administration interface or check the device label/metadata to confirm the model is Tenda A18Affected if Device is not a Tenda A18 extender, then not affected by this specific CVE
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Check firmware versionLog into the Tenda A18 web interface and navigate to System Settings > Firmware Upgrade, or use the device's administrative CLI if available, to identify the installed firmware versionAffected if Firmware version is 15.13.07.13 exactly - this is the only affected version
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Verify httpd web service is runningCheck if the httpd process is running on the device, typically accessible via the web interface on port 80 or 443Affected if httpd is running and the web interface is accessible, making the attack surface active
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Confirm WifiExtraSet endpoint existsAttempt to access or inspect the /goform/WifiExtraSet function in the httpd web service binary or documentationAffected if The WifiExtraSet function exists and accepts the wpapsk_crypto5g parameter, enabling the vulnerable code path
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Check web management interface exposureDetermine if the device's web interface is exposed to untrusted networks (WAN) or only accessible from the local network (LAN)Affected if The web management interface is externally accessible, increasing the risk of remote exploitation
The environment is affected only if the device is a Tenda A18 running exactly firmware version 15.13.07.13 with the httpd web service accessible and the /goform/WifiExtraSet endpoint present.
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 update available, apply immediately. Otherwise, restrict network access to the device's management interface via firewall rules or disable remote administration. Consider device replacement if no patch is forthcoming.
- 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-2026-2877 — 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-2026-2877 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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