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 — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 100%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 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 PROB
100%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

February 1, 2020

Last Modified

November 7, 2025

Advisory Details (3)

Auto-updated Sep 17, 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

Packet Storm Security

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 52× in last 7d / 218× 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 780 total refreshes for this CVE.

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

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

Explore →

Is Your Infrastructure Affected by CVE-2020-8515?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs