CVE-2024-39891 KEV
5.3
MEDIUM · CVSS 3.1 · EPSS 1.7% (pctl 76)
Patch first
On CISA KEV — known exploited in the wild, due 2024-08-13.
Description
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.)
Scoring
| CVSS | 5.3 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| EPSS | 1.67% — more likely to be exploited than 76% of all CVEs |
| Weakness | CWE-203 |
| On CISA KEV | yes — remediate by 2024-08-13 |
| Public exploit | none known |
| Published | 2024-07-02 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Twilio Authy Information Disclosure Vulnerability |
|---|---|
| Added | 2024-07-23 |
| Due | 2024-08-13 |
| Vendor / product | Twilio / Authy |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| twilio | authy |
| twilio | authy authenticator |
References
- https://cwe.mitre.org/data/definitions/203.html
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilities
- https://www.twilio.com/en-us/changelog
- https://cwe.mitre.org/data/definitions/203.html
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilities
- https://www.twilio.com/en-us/changelog
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891
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