# CVE-2026-85110: Tenda HG10 buffer overflow in formWlanSetup SSID parameter

Source: https://junglewise.ai/threats/cve-2026-85110-tenda-hg10-buffer-overflow-in-formwlansetup-ssid-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-85110 · Severity: high · CVSS 8.8 · Published 2026-09-03

Tenda HG10 is a wireless router and modem device used by homes and small businesses for internet connectivity. A buffer overflow vulnerability in the web management interface allows a remote attacker to crash the device or potentially execute arbitrary code by sending a specially crafted request with an overlong wireless network name (SSID) parameter. This could disrupt internet access for all connected users and compromise the security of the entire network.

Technologies: [Tenda HG10](https://junglewise.ai/threats/technologies/hg10). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-85110 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85110 being exploited in the wild.

**How severe is CVE-2026-85110?** High severity, with a CVSS score of 8.8, published 3 September 2026.

**Which products and versions are affected?** Tenda HG10 HG7_HG9_HG10re_300001138.

**Is there a fix for CVE-2026-85110?** 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-2026-85110 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-85110?** Check whether you run Tenda HG10 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 buffer overflow vulnerability exists in the Boa web server component of Tenda HG10 firmware version HG7_HG9_HG10re_300001138, specifically in the formWlanSetup function handling of the ssid parameter. The vulnerable code uses unsafe string operations (strcpy) to copy user-supplied input into a fixed-size buffer without length validation. An unauthenticated remote attacker can submit an HTTP POST request to /boaform/formWlanSetup with an overlong ssid value, causing a stack or heap buffer overflow. Successful exploitation results in denial-of-service (device crash) and potentially arbitrary code execution depending on memory layout and runtime protections. No patch status is currently indicated.

## Affected products

- Tenda HG10 HG7_HG9_HG10re_300001138

## Timeline

- 2026-09-03: disclosed

## References

- [https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/bof-formWlanSetup-ssid.md](https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/bof-formWlanSetup-ssid.md)
- [https://vuldb.com/cve/CVE-2026-85110](https://vuldb.com/cve/CVE-2026-85110)

## Related threats

- [Tenda HG7/HG9/HG10 stack buffer overflow in formLoopBack](https://junglewise.ai/threats/cve-2026-104610-a-security-vulnerability-has-been-detected-in-tenda-hg7-hg9-and)
- [Tenda HG10 OS command injection in formgponConf](https://junglewise.ai/threats/cve-2026-86167-tenda-hg10-os-command-injection-in-formgponconf)
- [Tenda HG10 buffer overflow in formWanRedirect](https://junglewise.ai/threats/cve-2026-86166-tenda-hg10-buffer-overflow-in-formwanredirect)
- [Tenda HG10 buffer overflow in formURL](https://junglewise.ai/threats/cve-2026-86165-tenda-hg10-buffer-overflow-in-formurl)
- [Tenda HG10 buffer overflow in Boa Web Server login handler](https://junglewise.ai/threats/cve-2026-85109-tenda-hg10-buffer-overflow-in-boa-web-server-login-handler)