# CVE-2026-6123: Tenda F451 stack-based buffer overflow in fromAddressNat

Source: https://junglewise.ai/threats/cve-2026-6123-tenda-f451-stack-based-buffer-overflow-in-fromaddressnat  
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-2026-6123 · 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 in 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 a foothold for further attacks on connected devices.

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-2026-6123 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6123 being exploited in the wild.

**How severe is CVE-2026-6123?** 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.

**Is there a fix for CVE-2026-6123?** 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-2026-6123 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-6123?** 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) within the 'httpd' component. The flaw is located in the 'fromAddressNat' function in the '/goform/addressNat' file, where improper validation of the 'entrys' argument allows for memory corruption. An attacker with low-level privileges can exploit this over the network to achieve remote code execution or cause a denial of service (DoS). Public exploit code is reportedly available, increasing the risk of exploitation. No official patch is mentioned in the advisory, so users should ensure management interfaces are not exposed to the public internet.

## Affected products

- Tenda F451 1.0.0.7

## Timeline

- 2026-04-12: disclosed: Initial disclosure of the vulnerability
- 2026-04-12: advisory: NVD publication date

## References

- [https://github.com/Jimi-Lab/cve/issues/15](https://github.com/Jimi-Lab/cve/issues/15)
- [https://vuldb.com/submit/792873](https://vuldb.com/submit/792873)
- [https://vuldb.com/submit/792879](https://vuldb.com/submit/792879)
- [https://vuldb.com/vuln/356986](https://vuldb.com/vuln/356986)
- [https://vuldb.com/vuln/356986/cti](https://vuldb.com/vuln/356986/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)