CVE-2024-39891

5.3 · MEDIUM Actively Exploited

Published Jul 2, 2024 twilio CWE-203 EPSS 1.67% (75th pctl) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Overview

CVE-2024-39891 is a medium-severity vulnerability affecting twilio authy. It was published on July 2, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.)

Remediation

Check the references section for vendor advisories and patches from twilio. Update authy to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor	Product	Versions	Status
twilio	authy	>= 0, < 26.1.0	Affected
twilio	authy_authenticator	>= 0, < 25.1.0	Affected

References

Ref cwe.mitre.org/data/definitions/203.html Ref www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/ Ref www.twilio.com/docs/usage/security/reporting-vulnerabilities Ref www.twilio.com/en-us/changelog Ref cwe.mitre.org/data/definitions/203.html Ref www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/ Ref www.twilio.com/docs/usage/security/reporting-vulnerabilities Ref www.twilio.com/en-us/changelog CISA www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891

Frequently Asked Questions

What is CVE-2024-39891?

How severe is CVE-2024-39891?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-39891?

How can CyberStrike help with CVE-2024-39891?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-39891 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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HackBrowser

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