Auth bypass in Dlink Dcs-825l
CVE-2025-55581
D-Link DCS-825L firmware version 1.08.01 and possibly prior versions contain an insecure implementation in the mydlink-watch-dog.sh script. The script monitors and respawns the `dcp` and `signalc` binaries without validating their integrity, origin, or permissions. An attacker with filesystem access (e.g., via UART or firmware modification) may replace these binaries to achieve persistent arbitrary code execution with root privileges. The issue stems from improper handling of executable trust and absence of integrity checks in the watchdog logic.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.dlink.com/en/security-bulletin/ (Not Applicable)
- legacy.us.dlink.com/pages/product.aspx (Product)
- cybermaya.in/posts/Post-42/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-55581?
- CVE-2025-55581 is a high-severity vulnerability in Dlink Dcs-825l, classified under Improper Privilege Management. CVSS score: 7.3/10. Published 2025-08-22.
- How severe is CVE-2025-55581?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2025-55581 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.