How severe is CVE-2020-25506?

CVE-2020-25506 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-25506 being actively exploited?

Yes. CVE-2020-25506 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2020-25506?

CVE-2020-25506 affects Dlink Dns-320 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-25506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2020-25506 have an EU (EUVD) identifier?

Yes. CVE-2020-25506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-18191. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2020-25506 published?

CVE-2020-25506 was published on 2021-02-02 and last updated on 2026-06-17.

CVE-2020-25506

CVE-2020-25506 is a critical-severity vulnerability in Dlink Dns-320 Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2020-18191
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Weakness: CWE-78
Affected product: Dlink Dns-320 Firmware
Published: 2021-02-02
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-25506?: CVE-2020-25506 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-25506 being actively exploited?: Yes. CVE-2020-25506 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2020-25506?: CVE-2020-25506 affects Dlink Dns-320 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-25506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2020-25506 have an EU (EUVD) identifier?: Yes. CVE-2020-25506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-18191. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2020-25506 published?: CVE-2020-25506 was published on 2021-02-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dns-320_firmware:2.06b01:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dns-320 Firmware

CVE-2024-3272 — Critical (CVSS 9.8): ** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as very critical, has been found in D-Link…
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CVE-2026-5212 — High (CVSS 8.8): A vulnerability has been found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L,…
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