01 Record

CVE-2024-39891

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

MediumKEVPUBLISHEDCNA: mitre

CNA base score5.3 CVSS v3.xCVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N

View raw JSON

02 Description

03 Exploitation and scoring

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2024-07-23. Federal remediation due 2024-08-13.

SSVC decision

ExploitationactiveCISA reports credible evidence of active exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.5% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-07-02 00:00Z2 YR AGO

Last updated

2025-10-21 22:55Z1 YR AGO

Reserved

2024-07-02

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

CVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N

Weaknesses

CWE-203Observable DiscrepancyBase

Data version

5.1

Document digest

17b6c5ba824b18aba4e52ac99e34f37311d3d23efc62c619b0b4f5a959819b97

05 Affected products

VendorProductVersionsPlatforms

twilioauthy_2-factor_authentication0 to < 26.1.0, 0 to < 25.1.0—

06 References

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