Buffer overflow in Tenda Ac21
CVE-2025-10838
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function sub_45BB10 of the file /goform/WifiExtraSet. The manipulation of the argument wpapsk_crypto leads to buffer overflow. It is possible to initiate…
Vulnerability class: Buffer Overflow
EPSS: 0.004 (58.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.
Affected products
- Tenda Ac21 — versions 16.03.08.16
Weakness classification (CWE)
References
- VDB-325200 | Tenda AC21 WifiExtraSet sub_45BB10 buffer overflow (vdb-entry, technical-description)
- VDB-325200 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #657126 | Tenda AC21 ≤V16.03.08.16 Buffer Overflow (third-party-advisory)
- github.com/lin-3-start/lin-cve/blob/main/Tenda AC21/Tenda AC21 Buffer overflow… (related)
- github.com/lin-3-start/lin-cve/blob/main/Tenda AC21/Tenda AC21 Buffer overflow… (exploit)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2025-10838?
- CVE-2025-10838 is a high-severity vulnerability in Tenda Ac21, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-09-23.
- How severe is CVE-2025-10838?
- High severity. CVSS v3 base score is 8.8 out of 10.