CVE-2016-20091

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

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

Windows Firewall Control 4.8.6.0 contains an unquoted service path vulnerability that allows local attackers to escalate privileges by inserting malicious executables in the service path. Attackers can place executable files in unquoted path directories that the wfcs.exe service will execute with LocalSystem privileges upon service restart or system reboot.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: Track*

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
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

Windows Firewall Control 4.8.6.0 Unquoted Service Path Privilege Escalation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/windows-firewall-control-unquoted-service-path-privilege-escalation
generic

BiniSoft.org

http://www.binisoft.org

Vendor Advisories for CVE-2016-20091(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 94× 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 182 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2016-20091?
CVE-2016-20091 is a high vulnerability published on June 19, 2026. Windows Firewall Control 4.8.6.0 contains an unquoted service path vulnerability that allows local attackers to escalate privileges by inserting malicious executables in the service path. Attackers can place executable files in unquoted path directories that the wfcs.exe service will execute with…
When was CVE-2016-20091 disclosed?
CVE-2016-20091 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20091 actively exploited?
CVE-2016-20091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.8% of all scored CVEs.
What is the CVSS score of CVE-2016-20091?
CVE-2016-20091 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2016-20091?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20091, 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.

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