# CVE-2026-15696: Tenda BE12 Pro stack buffer overflow in /goform/VirtualSer

Source: https://junglewise.ai/threats/cve-2026-15696-tenda-be12-pro-stack-buffer-overflow-in-goform-virtualser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-15696 · Severity: high · CVSS 8.8 · Published 2026-07-14

A vulnerability exists in the Tenda BE12 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 or use the router as a jumping-off point to attack other devices on the internal network.

Technologies: [Tenda BE12 Pro](https://junglewise.ai/threats/technologies/be12-pro). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-15696 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15696 being exploited in the wild.

**How severe is CVE-2026-15696?** High severity, with a CVSS score of 8.8, published 14 July 2026.

**Which products and versions are affected?** Tenda BE12 Pro 16.03.66.23.

**Is there a fix for CVE-2026-15696?** 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-2026-15696 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-15696?** Check whether you run Tenda BE12 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 Tenda BE12 Pro firmware version 16.03.66.23. The issue is located in the 'fromVirtualSer' function within the '/goform/VirtualSer' endpoint, where the user-supplied 'page' parameter is processed using the unsafe 'sprintf' function. Because the destination buffer is fixed at 256 bytes and lacks length validation, an attacker can provide an oversized input to overwrite adjacent stack memory. This can be exploited remotely to achieve arbitrary code execution or a denial of service (DoS) by crashing the web server process. A public proof-of-concept exists demonstrating the overflow using a 2048-byte payload.

## Affected products

- Tenda BE12 Pro 16.03.66.23

## Timeline

- 2026-06-11: disclosed: Initial disclosure on GitHub by researcher dexingzhiqing
- 2026-07-14: advisory: NVD/VulDB advisory published

## References

- [https://github.com/cve-a/dexingzhiqing/issues/6](https://github.com/cve-a/dexingzhiqing/issues/6)
- [https://vuldb.com/cve/CVE-2026-15696](https://vuldb.com/cve/CVE-2026-15696)
- [https://vuldb.com/submit/856019](https://vuldb.com/submit/856019)
- [https://vuldb.com/vuln/378243](https://vuldb.com/vuln/378243)
- [https://vuldb.com/vuln/378243/cti](https://vuldb.com/vuln/378243/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda BE12 Pro stack overflow in /goform/DhcpListClient](https://junglewise.ai/threats/cve-2026-15695-tenda-be12-pro-stack-overflow-in-goform-dhcplistclient)
- [Tenda BE12 Pro stack buffer overflow in /goform/SetIpBind](https://junglewise.ai/threats/cve-2026-15694-tenda-be12-pro-stack-buffer-overflow-in-goform-setipbind)
- [Tenda BE12 Pro stack buffer overflow in fromSafeMacFilter](https://junglewise.ai/threats/cve-2026-15693-tenda-be12-pro-stack-buffer-overflow-in-fromsafemacfilter)
- [Tenda BE12 Pro stack overflow in SafeUrlFilter](https://junglewise.ai/threats/cve-2026-15692-tenda-be12-pro-stack-overflow-in-safeurlfilter)
- [Tenda BE12 Pro stack overflow in /goform/SafeClientFilter](https://junglewise.ai/threats/cve-2026-15691-tenda-be12-pro-stack-overflow-in-goform-safeclientfilter)