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CVE-2024-39891

Twilio Authy Information Disclosure

5.3 MEDIUMActively exploited (CISA KEV)EPSS 1.67%
  1. Published2 Jul 2024
  2. Added to CISA KEV23 Jul 2024
  3. Remediation due13 Aug 2024
Actively exploited (CISA KEV)

Twilio Authy contains an information disclosure vulnerability in its API that allows an unauthenticated endpoint to accept a request containing a phone number and respond with information about whether the phone number was registered with Authy.

Added to KEV: 23 Jul 2024Federal remediation due: 13 Aug 2024

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Twilio Authy Authenticator< 25.1.0
Twilio Authy< 26.1.0

Remediation

Fixed in
Twilio Authy Authenticator≥ 25.1.0
Twilio Authy≥ 26.1.0

References

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Frequently asked

Is CVE-2024-39891 being actively exploited?

Yes. CVE-2024-39891 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 23 Jul 2024.

How severe is CVE-2024-39891?

CVE-2024-39891 has a CVSS 3.1 base score of 5.3, rated medium. EPSS estimates a 1.67% probability of exploitation.

Which products are affected by CVE-2024-39891?

Affected products include Twilio Authy Authenticator, Twilio Authy.

How do I fix CVE-2024-39891?

Upgrade affected software to a fixed version, for example Twilio Authy Authenticator 25.1.0, Twilio Authy 26.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-39891 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.