CVE-2024-39891 (GCVE-0-2024-39891)

Vulnerability from cvelistv5 – Published: 2024-07-02 00:00 – Updated: 2025-10-21 22:55
VLAI CISA KEVIntel
Summary
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.)
Severity
5.3 (Medium)
CVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • n/a
  • CWE-203 - Observable Discrepancy
Assigner
References
Impacted products
Vendor Product Version
twilio authy_2-factor_authentication Affected: 0 , < 26.1.0 (custom)
Affected: 0 , < 25.1.0 (custom)
    cpe:2.3:a:twilio:authy_2-factor_authentication:*:*:*:*:*:*:*:*
 Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7d0e47d0-8904-44c8-af55-7e1f0024cba4

Vulnerability ID: CVE-2024-39891

Status: Confirmed

Status Updated: 2024-07-23 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-07-23
Asserted: 2024-07-23
Scope
Notes: KEV entry: Twilio Authy Information Disclosure Vulnerability | Affected: Twilio / Authy | Description: Twilio Authy contains an information disclosure vulnerability in its API that allows an unauthenticated endpoint to accept a request containing a phone number and respond with information about whether the phone number was registered with Authy. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-08-13 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS; https://nvd.nist.gov/vuln/detail/CVE-2024-39891
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-203
Feed CISA Known Exploited Vulnerabilities Catalog
Product Authy
Due Date 2024-08-13
Date Added 2024-07-23
Vendorproject Twilio
Vulnerabilityname Twilio Authy Information Disclosure Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fa068fe0-abef-40aa-82ea-27dd91788f25

Vulnerability ID: CVE-2024-39891

Status: Confirmed

Status Updated: 2024-07-23 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-07-23
Asserted: 2024-07-23
Scope
Notes: KEVIntel entry: 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... | Affected: Twilio / Authy | CVSS: 5.3 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Twilio
Product Authy
Added Date 2024-07-23T00:00:00.000Z
Cvss Score 5.3
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC
Show details on NVD website
To clipboard 

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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.