CVE-2024-39891
What it is
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.)
At a glance
- Exploitability
- Can be exploited over the network without logging in. Limited direct impact.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- No patch or advisory is linked yet. Look at mitigations or restrict exposure.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- 2024-07-23 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- 2024-08-13 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 1.7% in the next 30 days (EPSS).
- Severity: 5.3 MEDIUM (CVSS).
- Fix: none linked yet, which raises it.
Details
- Published
- Last modified
- Added to CISA KEV
- 2024-07-23
- Exploit probability
- 1.7% · EPSS, next 30 days
- Weakness
- CWE-203
- Record status
- Analyzed
Affected
- Twilio Authy < 26.1.0
- Twilio Authy Authenticator < 25.1.0
Attack profile CVSS 3.1 · 5.3
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2024-39891.md and follow it. Check whether this project is affected by CVE-2024-39891. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
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