CVE-2019-16256

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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

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

Some Samsung devices include the SIMalliance Toolbox Browser (aka S@T Browser) on the UICC, which might allow remote attackers to retrieve location and IMEI information, or retrieve other data or execute certain commands, via SIM Toolkit (STK) instructions in an SMS message, aka Simjacker.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
91.1%
KEV
⚠ Exploited

Published

September 12, 2019

Last Modified

November 12, 2025

Advisory Details (2)

Auto-updated Jun 1, 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-2019-16256
generic

Simjacker - Next Generation Spying via SIM Card Vulnerability | Enea

https://www.adaptivemobile.com/blog/simjacker-next-generation-spying-over-mobile

Data Freshness Timeline

(refreshed 0× in last 7d / 0× 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. 2026-07-07 11:40 UTCEG score recompute
  2. 2026-07-07 11:40 UTCGHSA enrichment
  3. 2026-07-07 07:39 UTCEG score recompute
  4. 2026-07-07 07:39 UTCGHSA enrichment
  5. 2026-07-07 03:37 UTCEG score recompute
  6. 2026-07-07 03:37 UTCGHSA enrichment
  7. 2026-07-06 23:35 UTCEG score recompute
  8. 2026-07-06 23:35 UTCGHSA enrichment
  9. 2026-07-06 19:35 UTCEG score recompute
  10. 2026-07-06 19:34 UTCGHSA enrichment
  11. 2026-07-06 16:25 UTCEPSS rescore
  12. 2026-07-06 16:25 UTCEPSS rescore
  13. 2026-07-06 15:32 UTCEG score recompute
  14. 2026-07-06 15:32 UTCGHSA enrichment
  15. 2026-07-06 11:32 UTCEG score recompute
  16. 2026-07-06 11:31 UTCGHSA enrichment
  17. 2026-07-06 07:29 UTCEG score recompute
  18. 2026-07-06 07:29 UTCGHSA enrichment
  19. 2026-07-06 03:28 UTCEG score recompute
  20. 2026-07-06 03:28 UTCGHSA enrichment
  21. 2026-07-06 02:20 UTCEPSS rescore
  22. 2026-07-05 23:27 UTCEG score recompute
  23. 2026-07-05 23:27 UTCGHSA enrichment
  24. 2026-07-05 19:27 UTCEG score recompute
  25. 2026-07-05 19:27 UTCGHSA enrichment
Show 75 more
  1. 2026-07-05 15:26 UTCEG score recompute
  2. 2026-07-05 15:26 UTCGHSA enrichment
  3. 2026-07-05 11:24 UTCEG score recompute
  4. 2026-07-05 11:24 UTCGHSA enrichment
  5. 2026-07-05 07:23 UTCEG score recompute
  6. 2026-07-05 07:23 UTCGHSA enrichment
  7. 2026-07-05 03:23 UTCEG score recompute
  8. 2026-07-05 03:23 UTCGHSA enrichment
  9. 2026-07-05 02:27 UTCEPSS rescore
  10. 2026-07-04 23:21 UTCEG score recompute
  11. 2026-07-04 23:21 UTCGHSA enrichment
  12. 2026-07-04 19:19 UTCEG score recompute
  13. 2026-07-04 19:19 UTCGHSA enrichment
  14. 2026-07-04 15:18 UTCEG score recompute
  15. 2026-07-04 15:18 UTCGHSA enrichment
  16. 2026-07-04 11:17 UTCEG score recompute
  17. 2026-07-04 11:17 UTCGHSA enrichment
  18. 2026-07-04 07:17 UTCEG score recompute
  19. 2026-07-04 07:16 UTCGHSA enrichment
  20. 2026-07-04 06:28 UTCEPSS rescore
  21. 2026-07-04 03:14 UTCEG score recompute
  22. 2026-07-04 03:13 UTCGHSA enrichment
  23. 2026-07-03 23:13 UTCEG score recompute
  24. 2026-07-03 23:12 UTCGHSA enrichment
  25. 2026-07-03 19:11 UTCEG score recompute
  26. 2026-07-03 19:11 UTCGHSA enrichment
  27. 2026-07-03 15:11 UTCEG score recompute
  28. 2026-07-03 15:10 UTCGHSA enrichment
  29. 2026-07-03 11:09 UTCEG score recompute
  30. 2026-07-03 11:08 UTCGHSA enrichment
  31. 2026-07-03 07:08 UTCEG score recompute
  32. 2026-07-03 07:08 UTCGHSA enrichment
  33. 2026-07-03 03:07 UTCEG score recompute
  34. 2026-07-03 03:06 UTCGHSA enrichment
  35. 2026-07-02 23:05 UTCEG score recompute
  36. 2026-07-02 23:05 UTCGHSA enrichment
  37. 2026-07-02 19:05 UTCEG score recompute
  38. 2026-07-02 19:04 UTCGHSA enrichment
  39. 2026-07-02 15:04 UTCEG score recompute
  40. 2026-07-02 15:03 UTCGHSA enrichment
  41. 2026-07-02 11:02 UTCEG score recompute
  42. 2026-07-02 11:02 UTCGHSA enrichment
  43. 2026-07-02 07:01 UTCEG score recompute
  44. 2026-07-02 07:01 UTCGHSA enrichment
  45. 2026-07-02 02:59 UTCEG score recompute
  46. 2026-07-02 02:59 UTCGHSA enrichment
  47. 2026-07-01 22:59 UTCEG score recompute
  48. 2026-07-01 22:59 UTCGHSA enrichment
  49. 2026-07-01 19:16 UTCCISA KEV update
  50. 2026-07-01 18:59 UTCEG score recompute
  51. 2026-07-01 18:59 UTCGHSA enrichment
  52. 2026-07-01 15:03 UTCEPSS rescore
  53. 2026-07-01 15:03 UTCEPSS rescore
  54. 2026-07-01 14:59 UTCEG score recompute
  55. 2026-07-01 14:59 UTCGHSA enrichment
  56. 2026-07-01 10:59 UTCEG score recompute
  57. 2026-07-01 10:59 UTCGHSA enrichment
  58. 2026-07-01 06:58 UTCEG score recompute
  59. 2026-07-01 06:58 UTCGHSA enrichment
  60. 2026-07-01 02:58 UTCEG score recompute
  61. 2026-07-01 02:58 UTCGHSA enrichment
  62. 2026-06-30 23:20 UTCEPSS rescore
  63. 2026-06-30 22:57 UTCEG score recompute
  64. 2026-06-30 22:57 UTCGHSA enrichment
  65. 2026-06-30 18:56 UTCEG score recompute
  66. 2026-06-30 18:56 UTCGHSA enrichment
  67. 2026-06-30 14:55 UTCEG score recompute
  68. 2026-06-30 14:55 UTCGHSA enrichment
  69. 2026-06-30 10:54 UTCEG score recompute
  70. 2026-06-30 10:54 UTCGHSA enrichment
  71. 2026-06-30 06:50 UTCEG score recompute
  72. 2026-06-30 06:50 UTCGHSA enrichment
  73. 2026-06-30 02:49 UTCEG score recompute
  74. 2026-06-30 02:49 UTCGHSA enrichment
  75. 2026-06-29 22:49 UTCEG score recompute

Frequently asked(6)

What is CVE-2019-16256?
CVE-2019-16256 is a critical vulnerability published on September 12, 2019. Some Samsung devices include the SIMalliance Toolbox Browser (aka S@T Browser) on the UICC, which might allow remote attackers to retrieve location and IMEI information, or retrieve other data or execute certain commands, via SIM Toolkit (STK) instructions in an SMS message, aka Simjacker.
When was CVE-2019-16256 disclosed?
CVE-2019-16256 was first published in the National Vulnerability Database on September 12, 2019, with the most recent update on November 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-16256 actively exploited?
Yes. CISA added CVE-2019-16256 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting SIMalliance Toolbox Browser. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-16256?
CVE-2019-16256 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2019-16256?
CVE-2019-16256 affects SIMalliance Toolbox Browser. 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-2019-16256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-16256, 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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