CVE-2016-20091

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: Elevated riskExposed services: Not assessed

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

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
7.8HIGHmedium confidence
EG Risk
51
EG Risk 51/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 19, 2026

Last Modified

September 29, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
No fix on record 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 6× in last 7d / 26× 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 227 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 on June 19, 2026, with the most recent update on September 29, 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 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2016-20091?
CVE-2016-20091 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2016-20091?
No fix for CVE-2016-20091 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2016-20091 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2016-20091

Explore →

Is Your Infrastructure Affected by CVE-2016-20091?

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

Book a Demo →Browse All CVEs