# CVE-2026-5990: Tenda F451 stack buffer overflow in fromSafeEmailFilter

Source: https://junglewise.ai/threats/cve-2026-5990-tenda-f451-stack-buffer-overflow-in-fromsafeemailfilter  
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-2026-5990 · Severity: high · CVSS 8.8 · Published 2026-04-10

A vulnerability exists in the Tenda F451 wireless router that could allow an attacker to disrupt the device or take control of it. By sending a specially crafted request to the router's email filtering settings, an attacker can cause a system crash or execute unauthorized commands. This could lead to a total loss of internet connectivity or the compromise of data passing through the 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-2026-5990 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5990 being exploited in the wild.

**How severe is CVE-2026-5990?** 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-2026-5990?** 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-2026-5990 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-5990?** 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. The flaw is located within the 'fromSafeEmailFilter' function in the '/goform/SafeEmailFilter' component. An attacker can trigger the overflow by manipulating the 'page' argument in a remote request. Successful exploitation requires low-level authentication (PR:L) but can lead to full system compromise, including arbitrary code execution or a denial-of-service (DoS) condition. Public exploit code 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/8](https://github.com/Jimi-Lab/cve/issues/8)
- [https://vuldb.com/submit/792861](https://vuldb.com/submit/792861)
- [https://vuldb.com/vuln/356544](https://vuldb.com/vuln/356544)
- [https://vuldb.com/vuln/356544/cti](https://vuldb.com/vuln/356544/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

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- [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)