Persistent Privilege Escalation in D-Link DCS-825L Firmware
CVE-2025-55582

6.6MEDIUM

Key Information:

Vendor

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

What is CVE-2025-55582?

A vulnerability exists in the D-Link DCS-825L's firmware version 1.08.01, related to the mydlink-watch-dog.sh script. This script executes binaries like dcp and signalc without validating their integrity or permissions. This oversight allows an attacker with local access—gained either through physical means, firmware tampering, or debug tools—to replace critical binaries with malicious versions. The script, running as root in a continuous loop, creates a potential for persistent privilege escalation and arbitrary code execution. It's important to note that although this issue is resolved in firmware version 1.09.02, the DCS-825L is no longer supported and has reached End-of-Life status.

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References

https://www.dlink.com/en/security-bulletin/
https://supportannouncement.us.dlink.com/security/publica...
https://cybermaya.in/posts/Post-43/

CVSS V3.1

Score:
6.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Physical
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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