CVE-2026-0625— D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint
Quick assessment
Affected
D-Link DSL-2640B
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 DSL-2740R等都是中国友讯（D-Link）公司的产品。D-Link DSL-2740R是一款高性能 ADSL 路由器。D-Link DSL-2640B是一款无线ADSL路由宽带猫。D-Link DSL-2780B是一款无线ADSL路由宽带猫。 D-Link多款产品存在访问控制错误漏洞，该漏洞源于dnscfg.cgi端点对用户提供的DNS配置参数清理不当，可能导致远程命令执行。以下产品受到影响：D-Link DSL-2740R、DSL-2640B、DSL-2780B和DSL-526B。
Possible ATT&CK Techniques 3 AI
T1595 · Active Scanning T1556 · Modify Authentication Process T1557 · Adversary-in-the-MiddleAffected Version Matrix 17
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| D-Link | DIR-600 | |
affected |
| D-Link | DIR-608 | |
affected |
| D-Link | DIR-610 | |
affected |
| D-Link | DIR-611 | |
affected |
| D-Link | DIR-615 | |
affected |
| D-Link | DIR-905L | |
affected |
| D-Link | DNS-320 | |
affected |
| D-Link | DNS-325 | |
affected |
| D-Link | DNS-345 | |
affected |
| D-Link | DSL-2640B | |
affected |
| D-Link | DSL-2640T | |
affected |
| D-Link | DSL-2740R | |
affected |
| D-Link | DSL-2780B | |
affected |
| D-Link | DSL-500 | |
affected |
| D-Link | DSL-500G | |
affected |
| D-Link | DSL-502G | |
affected |
| D-Link | DSL-526B | |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-0625
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple D-Link DSL/DIR/DNS devices contain an authentication bypass and improper access control vulnerability in the dnscfg.cgi endpoint that allows an unauthenticated attacker to access DNS configuration functionality. By directly requesting this endpoint, an attacker can modify the device’s DNS settings without valid credentials, enabling DNS hijacking (“DNSChanger”) attacks that redirect user traffic to attacker-controlled infrastructure. In 2019, D-Link reported that this behavior was leveraged by the "GhostDNS" malware ecosystem targeting consumer and carrier routers. All impacted products were subsequently designated end-of-life/end-of-service, and no longer receive security updates. Exploitation evidence was observed by the Shadowserver Foundation on 2025-11-27 (UTC).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
D-Link多款产品 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DSL-2740R等都是中国友讯（D-Link）公司的产品。D-Link DSL-2740R是一款高性能 ADSL 路由器。D-Link DSL-2640B是一款无线ADSL路由宽带猫。D-Link DSL-2780B是一款无线ADSL路由宽带猫。 D-Link多款产品存在访问控制错误漏洞，该漏洞源于dnscfg.cgi端点对用户提供的DNS配置参数清理不当，可能导致远程命令执行。以下产品受到影响：D-Link DSL-2740R、DSL-2640B、DSL-2780B和DSL-526B。
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 | DSL-2640B | 0 | - |
|
| D-Link | DSL-2740R | 0 | - |
|
| D-Link | DSL-2780B | 0 | - |
|
| D-Link | DSL-526B | 0 | - |
|
| D-Link | DSL-2640T | 0 | - |
|
| D-Link | DSL-500 | 0 | - |
|
| D-Link | DSL-500G | 0 | - |
|
| D-Link | DSL-502G | 0 | - |
|
| D-Link | DIR-905L | 0 | - |
|
| D-Link | DIR-600 | 0 | - |
|
| D-Link | DIR-608 | 0 | - |
|
| D-Link | DIR-610 | 0 | - |
|
| D-Link | DIR-611 | 0 | - |
|
| D-Link | DIR-615 | 0 | - |
|
| D-Link | DNS-320 | 0 | - |
|
| D-Link | DNS-325 | 0 | - |
|
| D-Link | DNS-345 | 0 | - |
|
II. Public POCs for CVE-2026-0625
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-0625
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-0625 (1)
Other References for CVE-2026-0625 (3)
-
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10068 vendor-advisory patch mitigation
IV. Related Vulnerabilities
Same vendor: D-Link
-
CVE-2026-101081
D-Link DI-8400 Web Administration Service menu_nat_more.asp -
CVE-2026-100740
D-Link DIR-895L L2TP Control Channel tunnel.c tunnel_set_par -
CVE-2026-96891
D-Link DIR-825 rp-l2tp tunnel.c tunnel_set_params out-of-bou -
CVE-2026-95675
D-Link DAP-1360 6.14 Unauthenticated RCE via Web Management -
CVE-2026-94089
D-Link DIR-868L Authentication webfa_authentication.cgi strc
Same weakness: CWE-306
-
CVE-2026-77900
Azure App Service Remote Code Execution Vulnerability -
CVE-2026-84249
IBM Guardium Data Protection is affected by vulnerability -
CVE-2026-11318
Deskin 3.3.4.3 XPC Service Privilege Escalation via Unauthen -
CVE-2026-107779
Dromara Skyeye xxl-job-admin Missing Authentication on Job E -
CVE-2026-104076
TVU Networks Receiver/Transceiver Missing Authentication via
V. Comments for CVE-2026-0625
No comments yet