Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker run operating-system commands on an affected D-Link DNS-320 NAS. That can mean full device compromise, data theft, tampering, or service disruption. CISA lists the CVE as known exploited, so internet-exposed devices should be treated as urgent.
Executive priority
Prioritize as emergency remediation for any exposed device. The issue is remotely exploitable without credentials, has full-impact CVSS scoring, and is in CISA KEV. Unsupported or unpatchable devices should be isolated or replaced rather than accepted as normal risk.
Technical view
CVE-2020-25506 is CWE-78 command injection in D-Link DNS-320 firmware v2.06B01 Revision Ax, in system_mgr.cgi. The CVSS 3.1 score is 9.8: network reachable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where D-Link DNS-320 NAS web management or related CGI endpoints are reachable from the internet or untrusted networks. The source bundle names DNS-320 firmware v2.06B01 Revision Ax; broader affected product data is incomplete.
Exploitation context
CISA KEV inclusion indicates known exploitation in the wild. The bundle also includes a public technical reference, increasing researcher and attacker awareness. No exploit steps are included here, and the provided sources do not establish exact exploitation volume or targeting.
Researcher notes
The CVE record provides limited affected-product metadata, but the description specifically identifies D-Link DNS-320 FW v2.06B01 Revision Ax and system_mgr.cgi. Validate against vendor advisory SAP10183 before expanding scope. Avoid assuming fixes or affected versions not named in sources.
Mitigation direction
- Inventory D-Link DNS-320 devices and confirm firmware versions.
- Remove NAS management interfaces from internet exposure immediately.
- Restrict access to trusted administration networks or VPN only.
- Check D-Link SAP10183 and security bulletin for vendor guidance.
- Replace unsupported affected devices if no vendor fix is available.
- Review affected devices for signs of compromise before returning service.
Validation and detection
- Confirm whether any DNS-320 runs firmware v2.06B01 Revision Ax.
- Check external attack-surface scans for exposed NAS web interfaces.
- Review firewall rules for untrusted access to NAS management services.
- Inspect logs for suspicious system_mgr.cgi activity or unexpected command behavior.
- Verify remediation against D-Link guidance and document residual unsupported-device risk.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-25506 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dlink.com/en/security-bulletin/CVE reference · x_refsource_MISC
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10183CVE reference · x_refsource_MISC
- https://gist.github.com/WinMin/6f63fd1ae95977e0e2d49bd4b5f00675CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-25506CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.