Buffer overflow in Tenda Hg10
CVE-2026-85109
A vulnerability was determined in Tenda HG10 300001138. This issue affects the function formLogin of the file /boaform/formLogin of the component Boa Web Server. Executing a manipulation of the argument Username can lead to buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (65.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.011 · change: +0.005
Affected products
- Tenda Hg10 — versions 300001138
Weakness classification (CWE)
References
- github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/bof-for… (exploit)
- vuldb.com/cve/CVE-2026-85109 (third-party-advisory)
- vuldb.com/submit/891994 (third-party-advisory)
- vuldb.com/vuln/398315 (technical-description, vdb-entry)
- vuldb.com/vuln/398315/cti (signature, permissions-required)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-85109?
- CVE-2026-85109 is a critical-severity vulnerability in Tenda Hg10, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-09-03.
- How severe is CVE-2026-85109?
- Critical severity. CVSS v3 base score is 9.8 out of 10.