# CVE-2026-36813: Tenda W15E buffer overflow in formCropAndSetWewifiPic

Source: https://junglewise.ai/threats/cve-2026-36813-tenda-w15e-buffer-overflow-in-formcropandsetwewifipic  
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-2026-36813 · Severity: info · Published 2026-06-09

The Tenda W15E enterprise router contains a security flaw in its web management interface. By sending a specially crafted web request, an attacker can crash the device's management service. This results in a denial of service, preventing administrators from managing the network and potentially disrupting internet connectivity for the business.

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

## Quick answers

**Is CVE-2026-36813 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36813 being exploited in the wild.

**How severe is CVE-2026-36813?** Informational severity, published 9 June 2026.

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

**Is there a fix for CVE-2026-36813?** 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-2026-36813 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36813?** 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 v15.11.0.10 firmware within the 'formCropAndSetWewifiPic' function. The vulnerability is caused by the unsafe use of 'sprintf' when processing the 'picCropName' HTTP parameter retrieved via 'websGetVar'. An attacker can trigger the overflow by sending a crafted HTTP request to the affected CGI endpoint with an excessively long string in the 'picCropName' parameter. This results in a process crash or device instability, leading to a Denial of Service (DoS). No patch has been confirmed in the provided advisory.

## 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/formCropAndSetWewifiPic](https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formCropAndSetWewifiPic)

## 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 formDelwebAuthPic](https://junglewise.ai/threats/cve-2026-36811-tenda-w15e-buffer-overflow-in-formdelwebauthpic)
- [Tenda W15E buffer overflow in formPortalAuth](https://junglewise.ai/threats/cve-2026-36810-tenda-w15e-buffer-overflow-in-formportalauth)