Quick answers
- Is CVE-2026-86166 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86166 being exploited in the wild.
- How severe is CVE-2026-86166?
- High severity, with a CVSS score of 8.8, published 6 September 2026.
- Which products and versions are affected?
- Tenda HG10 300001138.
- Is there a fix for CVE-2026-86166?
- 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-2026-86166 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86166?
- 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 stack-based buffer overflow exists in the Boa web server's formWanRedirect function, triggered by improper validation of the 'if' parameter. The vulnerable code uses strcpy() to copy user-controlled input from an HTTP POST request into a fixed-size buffer without length checking. An attacker can send an oversized value for the 'if' parameter in a POST request to /boaform/formWanRedirect to overwrite adjacent stack memory. The attack requires no authentication and is remotely exploitable over the network. Confirmed impact includes denial of service (device crash); code execution may be possible depending on memory layout. No patch information is currently available.
Affected products
- Tenda HG10 300001138
Timeline
- 2026-09-06: disclosed