CVE-2020-8515

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.

DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.

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 1, 2020

Last Modified

November 7, 2025

Advisory Details (3)

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-2020-8515
generic

Vigor3900 / Vigor2960 / Vigor300B Router Web Management Page Vulnerability (CVE-2020-8515) | DrayTek

https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-%28cve-2020-8515%29/
generic

Packet Storm

http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.html

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 206× 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 377 total refreshes for this CVE.

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

Publicly available exploits

(5 references)

Working exploit code is in the public domain (3 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCdarrenmartyn/CVE-2020-8515
    First seen Sep 1, 2021

    Draytek CVE-2020-8515 PoC

    Open source ↗
  • GitHub PoCtruerandom/nmap_draytek_rce
    First seen Mar 31, 2020

    nmap script to detect CVE-2020-8515 on Draytek Devices

    Open source ↗
  • Exploit-DBEDB-48268
    First seen Mar 30, 2020

    Multiple DrayTek Products - Pre-authentication Remote Root Code Execution

    Open source ↗
  • GitHub PoCimjdl/CVE-2020-8515-PoC
    First seen Mar 30, 2020

    CVE-2020-8515-PoC

    Open source ↗
  • Nucleihttp/cves/2020/CVE-2020-8515.yaml
    First seen Jan 1, 2020

    DrayTek - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2020-8515?
CVE-2020-8515 is a critical vulnerability published on February 1, 2020. DrayTek Vigor2960 1.3.1Beta, Vigor3900 1.4.4Beta, and Vigor300B 1.3.3Beta, 1.4.2.1Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.
When was CVE-2020-8515 disclosed?
CVE-2020-8515 was first published in the National Vulnerability Database on February 1, 2020, 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-2020-8515 actively exploited?
Yes. CISA added CVE-2020-8515 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting DrayTek Multiple Vigor Routers. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-8515?
CVE-2020-8515 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-8515?
CVE-2020-8515 affects DrayTek Multiple Vigor Routers. 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-2020-8515?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8515, 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

Explore the affected products and dependency analysis for CVE-2020-8515

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