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CVE-2026-4377— Use of Weak Credentials in D-Link DWR-X1820 router

Quick assessment

Affected
D-Link Corporation DWR-X1820
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.

D-Link DWR-X1820是中国友讯（D-Link）公司的一款无线路由器。 D-Link DWR-X1820存在安全漏洞，该漏洞源于使用从IMEI号生成的弱默认密码且不要求用户更改，可能导致攻击者破解默认密码。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
D-Link Corporation DWR-X1820 1.00B14CP< 1.00B16CP affected
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I. Basic Information for CVE-2026-4377

Vulnerability Information
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Vulnerability Title
Use of Weak Credentials in D-Link DWR-X1820 router
Source: CVE Program / CVE List V5
Vulnerability Description
Dlink DWR-X1820 router uses weak default password generated from its IMEI number and does not require users to change it. An attacker who knows how passwords are generated can easily crack the default password if they have the device IMEI number. This issue was fixed in version 1.00B16CP.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1391
Source: CVE Program / CVE List V5
Vulnerability Title
D-Link DWR-X1820 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DWR-X1820是中国友讯（D-Link）公司的一款无线路由器。 D-Link DWR-X1820存在安全漏洞，该漏洞源于使用从IMEI号生成的弱默认密码且不要求用户更改，可能导致攻击者破解默认密码。
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
D-Link Corporation DWR-X1820 1.00B14CP ~ 1.00B16CP -

II. Public POCs for CVE-2026-4377

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III. Intelligence Information for CVE-2026-4377

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Security Blog Posts for CVE-2026-4377 (1)

Other References for CVE-2026-4377 (1)

IV. Related Vulnerabilities

Same vendor: D-Link Corporation
Same weakness: CWE-1391

V. Comments for CVE-2026-4377

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