# CVE-2026-15691: Tenda BE12 Pro stack overflow in /goform/SafeClientFilter

Source: https://junglewise.ai/threats/cve-2026-15691-tenda-be12-pro-stack-overflow-in-goform-safeclientfilter  
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-2026-15691 · Severity: high · CVSS 8.8 · Published 2026-07-14

A security vulnerability has been identified in the Tenda BE12 Pro router, a device used for home and business networking. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could lead to unauthorized monitoring of network traffic or the use of the router as a foothold to attack other devices on the local network.

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

## Quick answers

**Is CVE-2026-15691 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15691 being exploited in the wild.

**How severe is CVE-2026-15691?** 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-2026-15691?** 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-2026-15691 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-15691?** 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 the Tenda BE12 Pro router (firmware version 16.03.66.23) within the 'fromSafeClientFilter' function of the '/goform/SafeClientFilter' 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' argument. Successful exploitation can lead to memory corruption, denial of service (DoS), or arbitrary code execution by overwriting the return address on the stack. A public exploit has been released.

## Affected products

- Tenda BE12 Pro 16.03.66.23

## Timeline

- 2026-06-11: disclosed: Vulnerability details shared on GitHub by researcher
- 2026-07-14: advisory: CVE published to NVD dataset

## References

- [https://github.com/cve-a/dexingzhiqing/issues/1](https://github.com/cve-a/dexingzhiqing/issues/1)
- [https://vuldb.com/cve/CVE-2026-15691](https://vuldb.com/cve/CVE-2026-15691)
- [https://vuldb.com/submit/855999](https://vuldb.com/submit/855999)
- [https://vuldb.com/vuln/378238](https://vuldb.com/vuln/378238)
- [https://vuldb.com/vuln/378238/cti](https://vuldb.com/vuln/378238/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda BE12 Pro stack buffer overflow in /goform/VirtualSer](https://junglewise.ai/threats/cve-2026-15696-tenda-be12-pro-stack-buffer-overflow-in-goform-virtualser)
- [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)