CVE-2024-39891
MEDIUM CISA KEVCVSS v3
5.3
MEDIUM
EPSS Score
—
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.)
CISA Known Exploited Vulnerability
- Date Added
- 7/23/2024
- Patch Due Date
- 8/13/2024
- Required Action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 7/2/2024
- Last Modified
- 11/5/2025
Frequently Asked Questions
What is CVE-2024-39891?
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.)
Is CVE-2024-39891 actively exploited?
Yes. CVE-2024-39891 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 8/13/2024.
What is the CVSS score for CVE-2024-39891?
CVE-2024-39891 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string 3.1.
Is CVE-2024-39891 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.