CVE-2021-24042

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-04 · updated 2026-06-17
Weakness: CWE-122

Description

The calling logic for WhatsApp for Android prior to v2.21.23, WhatsApp Business for Android prior to v2.21.23, WhatsApp for iOS prior to v2.21.230, WhatsApp Business for iOS prior to v2.21.230, WhatsApp for KaiOS prior to v2.2143, WhatsApp Desktop prior to v2.2146 could have allowed an out-of-bounds write if a user makes a 1:1 call to a malicious actor.

Affected products

Facebook WhatsApp for Android: before 2.21.23; before 2.21.230; before 2.2143; before 2.2146 — fixed in 2.21.23, 2.21.230, 2.2143, 2.2146

How to fix

Upgrade to a fixed version: Facebook WhatsApp for Android 2.21.23, 2.21.230, 2.2143, 2.2146. Check the vendor advisory for mitigations.

References

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