# CVE-2026-6134: Tenda F451 stack buffer overflow in qossetting

Source: https://junglewise.ai/threats/cve-2026-6134-tenda-f451-stack-buffer-overflow-in-qossetting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-12. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-6134 · Severity: high · CVSS 8.8 · Published 2026-04-12

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 device or potentially take full control of it by sending specially crafted data to the router's management interface. This could lead to unauthorized access to network traffic or a complete disruption of internet services.

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-2026-6134 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6134 being exploited in the wild.

**How severe is CVE-2026-6134?** High severity, with a CVSS score of 8.8, published 12 April 2026.

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

**Is there a fix for CVE-2026-6134?** 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-2026-6134 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-6134?** 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 'fromqossetting' function in the '/goform/qossetting' handler. By manipulating the 'qos' argument, a remote attacker with low privileges can overflow the stack buffer. This can lead to remote code execution (RCE) or a denial of service (DoS) condition. Public exploit code has been released, increasing the risk of active exploitation.

## Affected products

- Tenda F451 1.0.0.7_cn_svn7958

## Timeline

- 2026-04-12: disclosed: Initial disclosure of the vulnerability
- 2026-04-12: advisory: Vulnerability published on NVD/VulDB

## References

- [https://github.com/Jimi-Lab/cve/issues/18](https://github.com/Jimi-Lab/cve/issues/18)
- [https://vuldb.com/submit/792876](https://vuldb.com/submit/792876)
- [https://vuldb.com/vuln/356998](https://vuldb.com/vuln/356998)
- [https://vuldb.com/vuln/356998/cti](https://vuldb.com/vuln/356998/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 buffer overflow in fromAdvSetWan](https://junglewise.ai/threats/cve-2026-6137-tenda-f451-stack-buffer-overflow-in-fromadvsetwan)
- [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)