High severity · published Jan 29, 2026
CVE-2026-1638
Tenda AC21 mDMZSetCfg command injection
8.8
CVSS
2.2%
EPSS
No
On KEV
Description
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 can be executed remotely. The exploit has been released to the public and may be used for attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.2% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
AC21 · Tenda
1.1.1.1; 1.dmzip; 16.03.08.16 · source: vendor
AF
Ac21 Firmware · Tenda
16.03.08.16 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1638
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1638
Broken Link
https://github.com/LX-LX88/cve/issues/26
Permissions Required
https://vuldb.com/?ctiid.343417
Third Party Advisory
https://vuldb.com/?id.343417
Third Party Advisory
https://vuldb.com/?submit.740871
Product
https://www.tenda.com.cn/
More from AC21
9.8
CVE-2025-13446
A vulnerability has been found in Tenda AC21 16.03.08.16
9.8
CVE-2025-13445
A flaw has been found in Tenda AC21 16.03.08.16
9.8
CVE-2025-12611
A vulnerability was identified in Tenda AC21 16.03.08.16
9.8
CVE-2025-9605
A security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16
8.8
CVE-2026-4565
Tenda AC21 SetNetControlList formSetQosBand buffer overflow