#VU104115 Stack-based buffer overflow in DIR-823 - CVE-2025-25740

Vulnerability identifier: #VU104115

Vulnerability risk: High

CVSSv4.0: 8.9 [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:P/U:Amber]

CVE-ID: CVE-2025-25740

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
DIR-823
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: D-Link

Description

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

The vulnerability exists due to a boundary error within the PSK parameter in the SetQuickVPNSettings module. A remote attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

DIR-823: All versions

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External links
https://dear-sunshine-ba5.notion.site/D-Link-DIR-853-2-1812386a66448036a1cce259beb30b04
https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10420

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.