CVE-2024-39891
Twilio Authy Information Disclosure Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 August 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.)
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 1.67% probability · 75th percentile
- CISA KEV
- Listed 23 July 2024 · due 13 August 2024
- Weakness
- CWE-203
- Affected
- twilio/authy · twilio/authy authenticator
- Source
- cve@mitre.org
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS; https://nvd.nist.gov/vuln/detail/CVE-2024-39891
References
- https://cwe.mitre.org/data/definitions/203.htmlTechnical Description
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/Press/Media Coverage
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilitiesProduct
- https://www.twilio.com/en-us/changelogRelease Notes
- https://cwe.mitre.org/data/definitions/203.htmlTechnical Description
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/Press/Media Coverage
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilitiesProduct
- https://www.twilio.com/en-us/changelogRelease Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.