Insecure Implementation in D-Link DCS-825L Firmware Affects Device Security
CVE-2025-55581

7.3HIGH

Key Information:

Vendor

D-Link
Status
DCS-825L
Vendor
CVE Published:
22 August 2025

What is CVE-2025-55581?

The D-Link DCS-825L device's firmware is compromised due to an insecure implementation within the mydlink-watch-dog.sh script. This script is designed to monitor and restart the dcp and signalc binaries. However, it fails to authenticate these binaries' integrity, source, or permissions. Consequently, an attacker with filesystem access—potentially gained through UART or firmware modifications—can substitute these binaries, enabling persistent arbitrary code execution with root privileges. This vulnerability arises from the inadequate management of executable trust and a lack of integrity checks in the watchdog architecture, highlighting a critical area for security improvements.

References

https://www.dlink.com/en/security-bulletin/
https://legacy.us.dlink.com/pages/product.aspx?id=f9c0458...
https://cybermaya.in/posts/Post-42/

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-55581 : Insecure Implementation in D-Link DCS-825L Firmware Affects Device Security