CVE-2019-9794

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

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

A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the default URI handler for a given URI scheme in third party applications and these applications insufficiently sanitize URL data. *Note: This issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
75.7%
KEV
Not listed

Published

April 26, 2019

Last Modified

November 25, 2025

Advisory Details (4)

Auto-updated Jun 8, 2026
No patch confirmed yet.
generic

Security vulnerabilities fixed in Thunderbird 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-11/
generic

Security vulnerabilities fixed in Firefox ESR 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-08/
generic

Security vulnerabilities fixed in Firefox 66 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-07/
generic

1530103 - (CVE-2019-9794) URI handler Remote Code Execution via command line parameter injection in Firefox

https://bugzilla.mozilla.org/show_bug.cgi?id=1530103

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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.

  1. 2026-07-16 16:59 UTCEPSS rescore
  2. 2026-07-16 16:59 UTCEPSS rescore
  3. 2026-07-15 16:55 UTCEPSS rescore
  4. 2026-07-13 22:27 UTCEPSS rescore
  5. 2026-07-13 06:10 UTCEPSS rescore
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  7. 2026-07-12 05:44 UTCEPSS rescore
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  10. 2026-07-08 15:11 UTCEPSS rescore
  11. 2026-07-07 13:43 UTCEPSS rescore
  12. 2026-07-06 16:25 UTCEPSS rescore
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  15. 2026-07-05 02:27 UTCEPSS rescore
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  17. 2026-07-01 15:03 UTCEPSS rescore
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  19. 2026-06-30 23:20 UTCEPSS rescore
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  21. 2026-06-29 14:04 UTCEPSS rescore
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  1. 2026-06-27 03:06 UTCEPSS rescore
  2. 2026-06-25 13:47 UTCEPSS rescore
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  4. 2026-06-24 14:03 UTCEPSS rescore
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  6. 2026-06-23 21:31 UTCEPSS rescore
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  8. 2026-06-22 14:23 UTCEPSS rescore
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  10. 2026-06-21 14:54 UTCEPSS rescore
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  14. 2026-06-19 19:23 UTCEPSS rescore
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  16. 2026-06-18 17:50 UTCEPSS rescore
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  18. 2026-06-17 17:50 UTCEPSS rescore
  19. 2026-06-16 17:50 UTCEPSS rescore
  20. 2026-06-15 17:46 UTCEPSS rescore
  21. 2026-06-14 23:15 UTCEPSS rescore
  22. 2026-06-14 23:15 UTCEPSS rescore
  23. 2026-06-13 22:58 UTCEPSS rescore
  24. 2026-06-12 23:09 UTCEPSS rescore
  25. 2026-06-12 23:09 UTCEPSS rescore
  26. 2026-06-11 13:58 UTCEPSS rescore
  27. 2026-06-10 22:16 UTCEPSS rescore
  28. 2026-06-10 22:16 UTCEPSS rescore
  29. 2026-06-10 13:19 UTCEPSS rescore
  30. 2026-06-08 14:15 UTCEPSS rescore
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  35. 2026-06-06 13:45 UTCEPSS rescore
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  37. 2026-06-05 22:45 UTCEPSS rescore
  38. 2026-06-05 06:08 UTCEPSS rescore
  39. 2026-06-04 13:10 UTCEPSS rescore
  40. 2026-06-04 13:10 UTCEPSS rescore
  41. 2026-06-02 20:11 UTCEPSS rescore
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  43. 2026-06-01 13:50 UTCEPSS rescore
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  45. 2026-05-31 22:29 UTCEPSS rescore
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  47. 2026-05-31 00:14 UTCEPSS rescore
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  49. 2026-05-29 13:42 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-27 20:05 UTCEG score recompute
  53. 2026-05-27 20:05 UTCGHSA enrichment
  54. 2026-05-27 13:39 UTCEPSS rescore
  55. 2026-05-27 13:38 UTCEPSS rescore
  56. 2026-05-26 13:42 UTCEPSS rescore
  57. 2026-05-26 07:17 UTCEPSS rescore
  58. 2026-05-26 07:17 UTCEPSS rescore
  59. 2026-05-26 07:17 UTCEPSS rescore
  60. 2026-05-24 16:47 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-9794?
CVE-2019-9794 is a critical vulnerability published on April 26, 2019. A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the…
When was CVE-2019-9794 disclosed?
CVE-2019-9794 was first published in the National Vulnerability Database on April 26, 2019, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9794 actively exploited?
CVE-2019-9794 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-9794?
CVE-2019-9794 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-9794?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9794, 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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