What is CVE-2020-25506?

CVE-2020-25506 is a critical-severity vulnerability in Dlink Dns-320, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-02-02.

How severe is CVE-2020-25506?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-25506 known to be exploited?

Yes. CVE-2020-25506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.

RCE in Dlink Dns-320

CVE-2020-25506

D-Link DNS-320 FW v2.06B01 Revision Ax is affected by command injection in the system_mgr.cgi component, which can lead to remote arbitrary code execution.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-02-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 1.000 (100.0th percentile), scored 2026-10-05.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Dlink Dns-320 — versions ax
Dlink Dns-320 Firmware — versions 2.06b01

Weakness classification (CWE)

CWE-78 — OS Command Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.dlink.com/en/security-bulletin/ (Vendor Advisory)
supportannouncement.us.dlink.com/announcement/publication.aspx (Vendor Advisory)
gist.github.com/WinMin/6f63fd1ae95977e0e2d49bd4b5f00675 (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2020-25506?: CVE-2020-25506 is a critical-severity vulnerability in Dlink Dns-320, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-02-02.
How severe is CVE-2020-25506?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-25506 known to be exploited?: Yes. CVE-2020-25506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.