CVE-2021-24027

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-06 · updated 2026-06-17
Weakness: CWE-524

Description

A cache configuration issue prior to WhatsApp for Android v2.21.4.18 and WhatsApp Business for Android v2.21.4.18 may have allowed a third party with access to the device’s external storage to read cached TLS material.

Affected products

Facebook WhatsApp for Android: before 2.21.4.18 — fixed in 2.21.4.18
Whatsapp Business: before 2.21.4.18 — fixed in 2.21.4.18

How to fix

Upgrade to a fixed version: Facebook WhatsApp for Android 2.21.4.18; Whatsapp Business 2.21.4.18. Check the vendor advisory for mitigations.

References

https://www.whatsapp.com/security/advisories/2021/
https://www.whatsapp.com/security/advisories/2021/

Get alerted when CVE-2021-24027 or the next vulnerability affects your stack