# CVE-2026-6137: Tenda F451 stack buffer overflow in fromAdvSetWan

Source: https://junglewise.ai/threats/cve-2026-6137-tenda-f451-stack-buffer-overflow-in-fromadvsetwan  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-13. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-6137 · Severity: high · CVSS 8.8 · Published 2026-04-13

A security vulnerability exists in the Tenda F451 wireless router, a device used to provide internet connectivity for homes and small offices. An attacker can exploit this flaw to crash the router or potentially take full control of the device. This could lead to unauthorized access to network traffic or a complete loss of internet service for the affected environment.

Technologies: [Tenda F451](https://junglewise.ai/threats/technologies/f451), [Tenda F451 Firmware](https://junglewise.ai/threats/technologies/f451-firmware). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-6137 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6137 being exploited in the wild.

**How severe is CVE-2026-6137?** High severity, with a CVSS score of 8.8, published 13 April 2026.

**Which products and versions are affected?** Tenda F451 1.0.0.7_cn_svn7958.

**Is there a fix for CVE-2026-6137?** 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-2026-6137 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-6137?** Check whether you run Tenda F451 or Tenda F451 Firmware. 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 F451 router (firmware version 1.0.0.7_cn_svn7958). The flaw is located within the 'fromAdvSetWan' function in the '/goform/AdvSetWan' component. The vulnerability is triggered by improper length validation of the 'wanmode' or 'PPPOEPassword' arguments. A remote attacker with low privileges can exploit this by sending a specially crafted request to the web management interface, leading to memory corruption. This can result in arbitrary code execution or a denial of service (DoS). Public exploit code is reportedly available.

## Affected products

- Tenda F451 1.0.0.7_cn_svn7958

## Timeline

- 2026-04-13: advisory: Initial disclosure date

## References

- [https://github.com/Jimi-Lab/cve/issues/22](https://github.com/Jimi-Lab/cve/issues/22)
- [https://vuldb.com/submit/792881](https://vuldb.com/submit/792881)
- [https://vuldb.com/vuln/357001](https://vuldb.com/vuln/357001)
- [https://vuldb.com/vuln/357001/cti](https://vuldb.com/vuln/357001/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda F451 stack-based buffer overflow in fromNatlimit](https://junglewise.ai/threats/cve-2026-11557-tenda-f451-stack-based-buffer-overflow-in-fromnatlimit)
- [Tenda F451 OS command injection in formWriteFacMac](https://junglewise.ai/threats/cve-2026-11556-tenda-f451-os-command-injection-in-formwritefacmac)
- [Tenda F451 stack-based buffer overflow in frmL7ImForm](https://junglewise.ai/threats/cve-2026-6136-tenda-f451-stack-based-buffer-overflow-in-frml7imform)
- [Tenda F451 stack overflow in SetIpBind](https://junglewise.ai/threats/cve-2026-6135-tenda-f451-stack-overflow-in-setipbind)
- [Tenda F451 stack buffer overflow in qossetting](https://junglewise.ai/threats/cve-2026-6134-tenda-f451-stack-buffer-overflow-in-qossetting)