CVE-2024-39891

CRITICALNVD 5.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-07-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.3 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: 2%CVSS: 5.3Exploit: cisa kev · ssvc activeExposed: 0

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

In the Twilio Authy API, accessed by Authy Android before 25.1.0 and Authy iOS before 26.1.0, an unauthenticated endpoint provided access to certain phone-number data, as exploited in the wild in June 2024. Specifically, the endpoint accepted a stream of requests containing phone numbers, and responded with information about whether each phone number was registered with Authy. (Authy accounts were not compromised, however.)

CVSS v3
5.3
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: 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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
76%
KEV
⚠ Exploited

Published

July 2, 2024

Last Modified

November 5, 2025

Advisory Details (5)

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-2024-39891
generic

Twilio Product Changelog and Announcements | Twilio

https://www.twilio.com/en-us/changelog
generic

Reporting Security Vulnerabilities | Twilio

https://www.twilio.com/docs/usage/security/reporting-vulnerabilities
generic

Hackers abused API to verify millions of Authy MFA phone numbers

https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/
generic

CWE - CWE-203: Observable Discrepancy (4.20)

https://cwe.mitre.org/data/definitions/203.html

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 59× in last 7d / 258× 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 936 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2024-39891?
CVE-2024-39891 is a critical vulnerability published on July 2, 2024. In the Twilio Authy API, accessed by Authy Android before 25.1.0 and Authy iOS before 26.1.0, an unauthenticated endpoint provided access to certain phone-number data, as exploited in the wild in June 2024. Specifically, the endpoint accepted a stream of requests containing phone numbers, and…
When was CVE-2024-39891 disclosed?
CVE-2024-39891 was first published in the National Vulnerability Database on July 2, 2024, with the most recent update on November 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-39891 actively exploited?
Yes. CISA added CVE-2024-39891 to the Known Exploited Vulnerabilities catalog on July 23, 2024, affecting Twilio Authy. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-39891?
CVE-2024-39891 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2024-39891?
CVE-2024-39891 affects Twilio Authy. 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-2024-39891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-39891, 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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