Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-1638— Tenda AC21 mDMZSetCfg command injection

Quick assessment

Affected
Tenda AC21
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 1.1.1.1/1.dmzip/16.03.08.16版本存在命令注入漏洞，该漏洞源于对文件/goform/mDMZSetCfg中参数dmzIp的错误操作，可能导致命令注入。

CVSS 6.3 · Medium EPSS 2.23% · P82
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-1638

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Tenda AC21 mDMZSetCfg command injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda AC21 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 1.1.1.1/1.dmzip/16.03.08.16版本存在命令注入漏洞，该漏洞源于对文件/goform/mDMZSetCfg中参数dmzIp的错误操作，可能导致命令注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tenda AC21 1.1.1.1 cpe:2.3:o:tenda:ac21_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-1638

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-1638

请登录查看更多情报信息。

News Coverage for CVE-2026-1638 (1)

Same Patch Batch · Tenda · 2026-01-29 · 3 CVEs total

CVE-2026-1637 8.8 HIGH Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
CVE-2026-1610 8.1 HIGH Tenda AX12 Pro V2 Telnet Service hard-coded credentials

IV. Related Vulnerabilities

Same product: AC21
Same vendor: Tenda
Same weakness: CWE-77

V. Comments for CVE-2026-1638

No comments yet

Leave a comment