CVE-2020-9934

CRITICALNVD 5.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-09-08), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.5 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 3%CVSS: 5.5Exploit: cisa kev · ssvc active · Metasploit · public exploitExposed: 0

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

An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6. A local user may be able to view sensitive user information.

CVSS v3
5.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
3%
EPSS %ILE
87%
KEV
⚠ Exploited

Published

October 16, 2020

Last Modified

October 23, 2025

Advisory Details (3)

Auto-updated Jun 13, 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-2020-9934
generic

About the security content of macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra - Apple Support

https://support.apple.com/HT211289
generic

About the security content of iOS 13.6 and iPadOS 13.6 - Apple Support

https://support.apple.com/HT211288

Data Freshness Timeline

(refreshed 57× in last 7d / 221× 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 641 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

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

  • GitHub PoCmattshockl/CVE-2020-9934
    First seen Jul 27, 2020

    CVE-2020–9934 POC

    Open source ↗
  • Metasploitpost/osx/escalate/tccbypass✓ verified
    First seen Jan 1, 2020

    Bypass the macOS TCC Framework

    Open source ↗

Frequently asked(6)

What is CVE-2020-9934?
CVE-2020-9934 is a critical vulnerability published on October 16, 2020. An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6. A local user may be able to view sensitive user information.
When was CVE-2020-9934 disclosed?
CVE-2020-9934 was first published in the National Vulnerability Database on October 16, 2020, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-9934 actively exploited?
Yes. CISA added CVE-2020-9934 to the Known Exploited Vulnerabilities catalog on September 8, 2022, affecting Apple iOS, iPadOS, and macOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-9934?
CVE-2020-9934 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-9934?
CVE-2020-9934 affects Apple iOS, iPadOS, and macOS. 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-2020-9934?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9934, 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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