CVE-2026-42372— D-Link DIR-605L A1 Hardcoded Telnet Backdoor Credentials
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I. Basic Information for CVE-2026-42372
Vulnerability Information
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Vulnerability Title
D-Link DIR-605L A1 Hardcoded Telnet Backdoor Credentials
Source: NVD (National Vulnerability Database)
Vulnerability Description
D-Link DIR-605L Hardware Revision A1 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username "Alphanetworks" and the static password "wrgn35_dlwbr_dir605l" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用硬编码的凭证
Source: NVD (National Vulnerability Database)
Vulnerability Title
D-Link DIR-605L 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DIR-605L是中国友讯（D-Link）公司的一款无线路由器。 D-Link DIR-605L Hardware Revision A1版本存在信任管理问题漏洞，该漏洞源于硬编码telnet后门，可能导致本地网络上的未经身份验证的攻击者通过静态密码获取root shell并完全管理控制。
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 | DIR-605L Firmware | A1 | cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:* |
II. Public POCs for CVE-2026-42372
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · D-Link · 2026-05-04 · 5 CVEs total
| CVE-2026-42376 | 9.8 CRITICAL | D-Link DIR-456U A1 Hardcoded Telnet Backdoor Credentials |
| CVE-2026-42375 | 9.8 CRITICAL | D-Link DIR-600L A1 Hardcoded Telnet Backdoor Credentials |
| CVE-2026-42374 | 9.8 CRITICAL | D-Link DIR-600L B1 Hardcoded Telnet Backdoor Credentials |
| CVE-2026-42373 | 9.8 CRITICAL | D-Link DIR-605L B2 Hardcoded Telnet Backdoor Credentials |
IV. Related Vulnerabilities
Same vendor: D-Link
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D-Link DCS-935L HNAP Service hnap_service SetDeviceSettings - CVE-2026-7857
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Same weakness: CWE-798
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D-Link DIR-456U A1 Hardcoded Telnet Backdoor Credentials - CVE-2026-42375
D-Link DIR-600L A1 Hardcoded Telnet Backdoor Credentials
V. Comments for CVE-2026-42372
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