CVE-2020-25506

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
100.0%
KEV
⚠ Exploited

Published

February 2, 2021

Last Modified

November 7, 2025

Advisory Details (4)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-25506
generic

Security Bulletin | D-Link

https://www.dlink.com/en/security-bulletin/
generic

D-Link Technical Support

https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10183
generic

Disclosure of vulnerabilities in D-LInk DNS320 · GitHub

https://gist.github.com/WinMin/6f63fd1ae95977e0e2d49bd4b5f00675

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 45× in last 7d / 207× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 376 total refreshes for this CVE.

  1. 2026-07-23 01:51 UTCEG score recompute
  2. 2026-07-22 23:23 UTCEG score recompute
  3. 2026-07-22 23:23 UTCGHSA enrichment
  4. 2026-07-22 22:37 UTCEG score recompute
  5. 2026-07-22 19:40 UTCCISA KEV update
  6. 2026-07-22 19:33 UTCGHSA enrichment
  7. 2026-07-22 15:41 UTCGHSA enrichment
  8. 2026-07-22 11:50 UTCGHSA enrichment
  9. 2026-07-22 07:59 UTCGHSA enrichment
  10. 2026-07-22 04:07 UTCGHSA enrichment
  11. 2026-07-22 00:08 UTCGHSA enrichment
  12. 2026-07-21 18:12 UTCGHSA enrichment
  13. 2026-07-21 14:37 UTCCISA KEV update
  14. 2026-07-21 14:21 UTCGHSA enrichment
  15. 2026-07-21 10:30 UTCGHSA enrichment
  16. 2026-07-21 06:39 UTCGHSA enrichment
  17. 2026-07-21 02:48 UTCGHSA enrichment
  18. 2026-07-20 22:56 UTCGHSA enrichment
  19. 2026-07-20 19:06 UTCGHSA enrichment
  20. 2026-07-20 15:15 UTCGHSA enrichment
  21. 2026-07-20 11:25 UTCGHSA enrichment
  22. 2026-07-20 07:35 UTCGHSA enrichment
  23. 2026-07-20 03:45 UTCGHSA enrichment
  24. 2026-07-19 23:55 UTCGHSA enrichment
  25. 2026-07-19 20:05 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 16:14 UTCGHSA enrichment
  2. 2026-07-19 12:16 UTCGHSA enrichment
  3. 2026-07-19 08:26 UTCGHSA enrichment
  4. 2026-07-19 04:34 UTCGHSA enrichment
  5. 2026-07-19 00:43 UTCGHSA enrichment
  6. 2026-07-18 20:51 UTCGHSA enrichment
  7. 2026-07-18 17:00 UTCGHSA enrichment
  8. 2026-07-18 13:10 UTCGHSA enrichment
  9. 2026-07-18 09:20 UTCGHSA enrichment
  10. 2026-07-18 05:30 UTCGHSA enrichment
  11. 2026-07-18 01:40 UTCGHSA enrichment
  12. 2026-07-17 21:50 UTCGHSA enrichment
  13. 2026-07-17 17:59 UTCGHSA enrichment
  14. 2026-07-17 14:08 UTCGHSA enrichment
  15. 2026-07-17 10:18 UTCEG score recompute
  16. 2026-07-17 10:18 UTCGHSA enrichment
  17. 2026-07-17 06:28 UTCGHSA enrichment
  18. 2026-07-17 02:38 UTCGHSA enrichment
  19. 2026-07-16 22:48 UTCGHSA enrichment
  20. 2026-07-16 18:58 UTCGHSA enrichment
  21. 2026-07-16 17:04 UTCCISA KEV update
  22. 2026-07-16 15:07 UTCGHSA enrichment
  23. 2026-07-16 11:17 UTCGHSA enrichment
  24. 2026-07-16 07:27 UTCGHSA enrichment
  25. 2026-07-16 03:37 UTCGHSA enrichment
  26. 2026-07-15 23:47 UTCGHSA enrichment
  27. 2026-07-15 19:57 UTCGHSA enrichment
  28. 2026-07-15 16:55 UTCEPSS rescore
  29. 2026-07-15 16:49 UTCCISA KEV update
  30. 2026-07-15 16:07 UTCGHSA enrichment
  31. 2026-07-15 15:04 UTCCISA KEV update
  32. 2026-07-15 12:16 UTCGHSA enrichment
  33. 2026-07-15 08:24 UTCGHSA enrichment
  34. 2026-07-15 04:32 UTCGHSA enrichment
  35. 2026-07-15 00:38 UTCGHSA enrichment
  36. 2026-07-14 20:46 UTCGHSA enrichment
  37. 2026-07-14 18:05 UTCCISA KEV update
  38. 2026-07-14 16:56 UTCGHSA enrichment
  39. 2026-07-14 13:06 UTCGHSA enrichment
  40. 2026-07-14 09:15 UTCGHSA enrichment
  41. 2026-07-14 05:25 UTCGHSA enrichment
  42. 2026-07-14 01:35 UTCGHSA enrichment
  43. 2026-07-13 21:45 UTCGHSA enrichment
  44. 2026-07-13 17:53 UTCGHSA enrichment
  45. 2026-07-13 17:07 UTCCISA KEV update
  46. 2026-07-13 14:01 UTCGHSA enrichment
  47. 2026-07-13 10:11 UTCGHSA enrichment
  48. 2026-07-13 06:20 UTCGHSA enrichment
  49. 2026-07-13 02:28 UTCGHSA enrichment
  50. 2026-07-12 22:37 UTCGHSA enrichment
  51. 2026-07-12 18:46 UTCGHSA enrichment
  52. 2026-07-12 14:55 UTCGHSA enrichment
  53. 2026-07-12 11:03 UTCGHSA enrichment
  54. 2026-07-12 07:12 UTCGHSA enrichment
  55. 2026-07-12 05:44 UTCEPSS rescore
  56. 2026-07-12 03:21 UTCGHSA enrichment
  57. 2026-07-11 23:31 UTCGHSA enrichment
  58. 2026-07-11 19:41 UTCGHSA enrichment
  59. 2026-07-11 15:51 UTCGHSA enrichment
  60. 2026-07-11 12:00 UTCGHSA enrichment
  61. 2026-07-11 08:10 UTCGHSA enrichment
  62. 2026-07-11 04:20 UTCGHSA enrichment
  63. 2026-07-11 00:30 UTCGHSA enrichment
  64. 2026-07-10 20:39 UTCGHSA enrichment
  65. 2026-07-10 17:52 UTCCISA KEV update
  66. 2026-07-10 16:49 UTCGHSA enrichment
  67. 2026-07-10 12:58 UTCGHSA enrichment
  68. 2026-07-10 09:07 UTCGHSA enrichment
  69. 2026-07-10 05:17 UTCGHSA enrichment
  70. 2026-07-10 01:22 UTCGHSA enrichment
  71. 2026-07-09 21:31 UTCGHSA enrichment
  72. 2026-07-09 19:07 UTCEPSS rescore
  73. 2026-07-09 17:39 UTCGHSA enrichment
  74. 2026-07-09 13:49 UTCGHSA enrichment
  75. 2026-07-09 09:56 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2020/CVE-2020-25506.yaml
    First seen Jan 1, 2020

    D-Link DNS-320 - Unauthenticated Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2020-25506?
CVE-2020-25506 is a critical vulnerability published on February 2, 2021. 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.
When was CVE-2020-25506 disclosed?
CVE-2020-25506 was first published in the National Vulnerability Database on February 2, 2021, with the most recent update on November 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-25506 actively exploited?
Yes. CISA added CVE-2020-25506 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting D-Link DNS-320 Device. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-25506?
CVE-2020-25506 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-25506?
CVE-2020-25506 affects D-Link DNS-320 Device. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2020-25506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25506, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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