# CVE-2026-36811: Tenda W15E buffer overflow in formDelwebAuthPic

Source: https://junglewise.ai/threats/cve-2026-36811-tenda-w15e-buffer-overflow-in-formdelwebauthpic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-36811 · Severity: info · CVSS 7.5 · Published 2026-06-09

The Tenda W15E is a wireless router used for business and home networking. A security flaw in how the device handles certain web requests allows an attacker to crash the router by sending a specially crafted message. This results in a denial of service, cutting off internet and network access for all connected users until the device is recovered.

Technologies: [Tenda W15E](https://junglewise.ai/threats/technologies/w15e). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-36811 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36811 being exploited in the wild.

**How severe is CVE-2026-36811?** Informational severity, with a CVSS score of 7.5, published 9 June 2026.

**Which products and versions are affected?** Tenda W15E v15.11.0.10.

**Is there a fix for CVE-2026-36811?** 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-2026-36811 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36811?** Check whether you run Tenda W15E at an affected version. 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 exists in the Tenda W15E router firmware version v15.11.0.10. The vulnerability is located within the 'formDelwebAuthPic' function, which is mapped to the 'delWebAuthPic' action. The root cause is the unsafe use of 'sprintf' to copy the user-supplied 'picName' HTTP parameter into a fixed-size buffer ('picPath') without length validation. An unauthenticated remote attacker can exploit this by sending a crafted HTTP request with an excessively long 'picName' string, leading to a process crash and Denial of Service (DoS).

## Affected products

- Tenda W15E v15.11.0.10

## Timeline

- 2026-03-18: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-09: advisory: NVD published date

## References

- [https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formDelwebAuthPic](https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formDelwebAuthPic)

## Related threats

- [Tenda W15E buffer overflow in formAddWebAuthWhiteUser](https://junglewise.ai/threats/cve-2026-36817-tenda-w15e-buffer-overflow-in-formaddwebauthwhiteuser)
- [Tenda W15E buffer overflow in formAddWewifiWhiteUser](https://junglewise.ai/threats/cve-2026-36816-tenda-w15e-buffer-overflow-in-formaddwewifiwhiteuser)
- [Tenda W15E buffer overflow in formSetNetCheckTools](https://junglewise.ai/threats/cve-2026-36815-tenda-w15e-buffer-overflow-in-formsetnetchecktools)
- [Tenda W15E buffer overflow in formCropAndSetWewifiPic](https://junglewise.ai/threats/cve-2026-36813-tenda-w15e-buffer-overflow-in-formcropandsetwewifipic)
- [Tenda W15E buffer overflow in formPortalAuth](https://junglewise.ai/threats/cve-2026-36810-tenda-w15e-buffer-overflow-in-formportalauth)