Known exploited vulnerability
CVE-2024-39891
The short answer
CVE-2024-39891 affects n/a n/a and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2024-07-23: attackers are using it, so patch it first.
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.)
Weakness: CWE-203.
Severity
5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploited (CISA KEV)
Yes, since Jul 23, 2024
Federal due date Aug 13, 2024
EPSS, next 30 days
1.7%
Higher than 77% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
n/a, authy_2-factor_authentication. NVD's record lists the exact affected versions.
References
- cwe.mitre.org/data/definitions/203.html Technical Description
- www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/ Press/Media Coverage
- www.twilio.com/docs/usage/security/reporting-vulnerabilities Product
- www.twilio.com/en-us/changelog Release Notes
- cwe.mitre.org/data/definitions/203.html Technical Description
- www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/ Press/Media Coverage
- www.twilio.com/docs/usage/security/reporting-vulnerabilities Product
- www.twilio.com/en-us/changelog Release Notes
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891 US Government Resource
Questions
Is CVE-2024-39891 being exploited?
Yes. CISA added CVE-2024-39891 to its Known Exploited Vulnerabilities catalog on 2024-07-23, with a federal remediation due date of 2024-08-13.
How do I fix CVE-2024-39891?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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