# CVE-2026-5991: Tenda F451 stack overflow in formWrlExtraSet

Source: https://junglewise.ai/threats/cve-2026-5991-tenda-f451-stack-overflow-in-formwrlextraset  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-10. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-5991 · Severity: high · CVSS 8.8 · Published 2026-04-10

A 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 cause a system crash or potentially take full control of the router. This could lead to unauthorized access to network traffic, service outages, or the use of the device as a foothold for further attacks on the internal network.

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-2026-5991 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5991 being exploited in the wild.

**How severe is CVE-2026-5991?** High severity, with a CVSS score of 8.8, published 10 April 2026.

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

**Is there a fix for CVE-2026-5991?** 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-2026-5991 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-5991?** 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 running firmware version 1.0.0.7. The flaw is located within the 'formWrlExtraSet' function in the '/goform/WrlExtraSet' component. The vulnerability is triggered by improper validation of the 'GO' argument, which allows an attacker to overwrite the stack. While the attack can be launched remotely, it requires low-level authentication (PR:L). Successful exploitation can lead to complete compromise of the device (Confidentiality, Integrity, and Availability impact). A public exploit is reportedly available.

## Affected products

- Tenda F451 1.0.0.7

## Timeline

- 2026-04-10: disclosed: Initial publication date

## References

- [https://github.com/Jimi-Lab/cve/issues/9](https://github.com/Jimi-Lab/cve/issues/9)
- [https://vuldb.com/submit/792862](https://vuldb.com/submit/792862)
- [https://vuldb.com/vuln/356545](https://vuldb.com/vuln/356545)
- [https://vuldb.com/vuln/356545/cti](https://vuldb.com/vuln/356545/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)