RCE in Tenda Ac21
CVE-2026-1638
A security flaw has been discovered in Tenda AC21 1.1.1.1/1.dmzip/16.03.08.16. The impacted element is the function mDMZSetCfg of the file /goform/mDMZSetCfg. The manipulation of the argument dmzIp results in command injection. The attack…
EPSS: 0.002 (36.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Tenda Ac21 — versions 1.1.1.1, 1.dmzip, 16.03.08.16
- Tenda Ac21_firmware — versions 16.03.08.16
Weakness classification (CWE)
References
- VDB-343417 | Tenda AC21 mDMZSetCfg command injection (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-343417 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #740871 | Tenda AC21 V16.03.08.16 Command Injection (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (issue-tracking, exploit, broken-link, Broken Link)
- cna@vuldb.com (Product, product)
Frequently asked questions
- What is CVE-2026-1638?
- CVE-2026-1638 is a medium-severity vulnerability in Tenda Ac21, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-01-30.
- How severe is CVE-2026-1638?
- Medium severity. CVSS v3 base score is 6.3 out of 10.