# CVE-2026-13519: Tenda JD12L Pro stack buffer overflow in NatStaticSetting

Source: https://junglewise.ai/threats/cve-2026-13519-tenda-jd12l-pro-stack-buffer-overflow-in-natstaticsetting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-13519 · Severity: high · CVSS 8.8 · Published 2026-06-29

A vulnerability exists in the Tenda JD12L Pro router, a device used to provide wireless internet connectivity. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could allow an unauthorized user to monitor network traffic, steal data, or use the compromised router to launch further attacks on other devices within the network.

Technologies: [Tenda JD12L Pro](https://junglewise.ai/threats/technologies/jd12l-pro). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-13519 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13519 being exploited in the wild.

**How severe is CVE-2026-13519?** High severity, with a CVSS score of 8.8, published 29 June 2026.

**Which products and versions are affected?** Tenda JD12L Pro 16.03.53.23.

**Is there a fix for CVE-2026-13519?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-13519 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-13519?** Check whether you run Tenda JD12L Pro at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in the Tenda JD12L Pro router (firmware version 16.03.53.23) within the 'fromNatStaticSetting' function of the '/goform/NatStaticSetting' endpoint. The root cause is the unsafe use of 'sprintf' to process the user-controlled 'page' parameter into a fixed-size 256-byte buffer without length validation. A remote attacker can exploit this by sending a specially crafted POST request with an oversized 'page' value. Successful exploitation can lead to memory corruption, overwriting the return address on the stack to achieve arbitrary code execution, or causing a Denial of Service (DoS) by crashing the web server process. A public exploit (PoC) is available.

## Affected products

- Tenda JD12L Pro 16.03.53.23

## Timeline

- 2026-05-27: disclosed: Initial disclosure on GitHub by researcher Li Kunyang
- 2026-06-29: advisory: NVD publication date

## References

- [https://github.com/cve-a/Yuanji-Wanshu/issues/1](https://github.com/cve-a/Yuanji-Wanshu/issues/1)
- [https://vuldb.com/cve/CVE-2026-13519](https://vuldb.com/cve/CVE-2026-13519)
- [https://vuldb.com/submit/838993](https://vuldb.com/submit/838993)
- [https://vuldb.com/vuln/374527](https://vuldb.com/vuln/374527)
- [https://vuldb.com/vuln/374527/cti](https://vuldb.com/vuln/374527/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda JD12L Pro stack buffer overflow in /goform/addressNat](https://junglewise.ai/threats/cve-2026-13518-tenda-jd12l-pro-stack-buffer-overflow-in-goform-addressnat)
- [Tenda JD12L Pro stack overflow in WifiBasicSet](https://junglewise.ai/threats/cve-2026-13517-tenda-jd12l-pro-stack-overflow-in-wifibasicset)
- [Tenda JD12L Pro stack buffer overflow in WifiGuestSet](https://junglewise.ai/threats/cve-2026-13516-tenda-jd12l-pro-stack-buffer-overflow-in-wifiguestset)
- [Tenda JD12L Pro stack overflow in SetPptpServerCfg](https://junglewise.ai/threats/cve-2026-13515-tenda-jd12l-pro-stack-overflow-in-setpptpservercfg)