CVE-2026-13515
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 security vulnerability has been detected in Tenda JD12L 16.03.53.23. Impacted is the function formSetPPTPServer of the file /goform/SetPptpServerCfg. Such manipulation of the argument startIp leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed publicly 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 confidenceStack-based buffer overflow in Tenda JD12L router firmware 16.03.53.23 within the formSetPPTPServer function at /goform/SetPptpServerCfg. The startIp parameter passed to this PPTP server configuration endpoint is not properly validated before use, allowing an attacker to overflow a stack buffer via specially crafted input. This is a remote, network-exploitable vulnerability with publicly available exploit code, potentially allowing remote code execution on the affected device.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- 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 device modelAccess router web interface or check device label to confirm it is a Tenda JD12L routerAffected if Device is not a Tenda JD12L router - not affected by this specific CVE
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Check firmware versionNavigate to router admin panel (typically 192.168.0.1) and locate firmware version in System Settings or Status pageAffected if Firmware version is 16.03.53.23 - matches the affected version exactly
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Verify PPTP server configuration accessCheck if you can access the /goform/SetPptpServerCfg endpoint or check VPN/PPTP settings in router admin panelAffected if PPTP server functionality exists on the device and is configurable
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Review for exploitation indicatorsExamine router access logs for POST requests to /goform/SetPptpServerCfg with abnormally long startIp parameter valuesAffected if Suspicious requests found with oversized startIp values
You are affected if you have a Tenda JD12L router running firmware version 16.03.53.23 with PPTP server features accessible on the 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 dataUpdate firmware if vendor releases a patch; otherwise disable the PPTP server functionality if unused, implement network segmentation to isolate the device, and monitor for exploitation attempts.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-13515 — 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-2026-13515 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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