Remote code execution in unsupported D-Link DSL gateways



Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2026-0625
CWE-ID CWE-78
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
 DSL-526B
Hardware solutions / Routers for home users

DSL-2780B
Hardware solutions / Routers for home users

DSL-2740R
Hardware solutions / Routers for home users

DSL-2640B
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor D-Link

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) OS command injection

EUVDB-ID: #VU121021

Risk: Critical

CVSSv4.0: 9.3 [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/E:A/U:Red]

CVE-ID: CVE-2026-0625

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation within the dnscfg.cgi endpoint. A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

According to D-Link, the vulnerability is fixed only in the DSL-2740R model. All listed device models are no longer supported by the vendor and are not expected to receive security updates. 

Vulnerable software versions

DSL-526B: All versions

DSL-2640B: All versions

DSL-2780B: All versions

DSL-2740R: before 1.17

CPE2.3 External links

https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10488
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10068
https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.



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