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Exploited vulnerability · CISA KEV

Is CVE-2024-39891 exploited? Yes: in CISA KEV since 23 Jul 2024

Gociux · Twilio Authy · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-39891, Twilio Authy Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 Jul 2024, 21 days after it was published. It affects Twilio Authy. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 23 Jul 2024
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity5.3CVSS 3.1 · medium
US federal due13 Aug 2024BOD 22-01 deadline

What it is

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.

VendorTwilio (1 exploited CVE in KEV)
ProductAuthy
VulnerabilityTwilio Authy Information Disclosure Vulnerability
WeaknessCWE-203
Published2 Jul 2024
Added to KEV23 Jul 2024
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Authy in your asset inventory, including appliances and cloud images. Stack check lists every exploited Twilio CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 2 Jul 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Twilio.

References

Questions

Is CVE-2024-39891 being exploited?

Yes. CISA added CVE-2024-39891 to the Known Exploited Vulnerabilities catalog on 23 Jul 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-39891 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-39891?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Twilio's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Authy and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2024 · act-now radar.

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