CVE-2025-27840

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory published 2025-03-08. NVD baseline CVSS 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.8Exploit: Elevated riskExposed: 0

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

Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: 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
Severity68% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
70%
KEV
Not listed

Published

March 8, 2025

Last Modified

March 12, 2025

References (15)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 139 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCdemining/Bluetooth-Attacks-CVE-2025-27840
    First seen Mar 30, 2025

    Bitcoin Cryptanalysis: CVE-2025-27840 Vulnerability in ESP32 Microcontrollers Puts Billions of IoT Devices at Risk via Wi-Fi & Bluetooth

    Open source ↗
  • GitHub PoCem0gi/CVE-2025-27840
    First seen Mar 9, 2025

    Expanded version of the code shown at RootedCON redone in python - CVE-2025-27840

    Open source ↗

Frequently asked(5)

What is CVE-2025-27840?
CVE-2025-27840 is a medium vulnerability published on March 8, 2025. Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
When was CVE-2025-27840 disclosed?
CVE-2025-27840 was first published in the National Vulnerability Database on March 8, 2025, with the most recent update on March 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-27840 actively exploited?
CVE-2025-27840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 30.2% of all scored CVEs.
What is the CVSS score of CVE-2025-27840?
CVE-2025-27840 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2025-27840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-27840, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-27840

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