CVE-2021-24035

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-11 · updated 2026-06-17
Weakness: CWE-23

Description

A lack of filename validation when unzipping archives prior to WhatsApp for Android v2.21.8.13 and WhatsApp Business for Android v2.21.8.13 could have allowed path traversal attacks that overwrite WhatsApp files.

Affected products

Facebook WhatsApp for Android: before 2.21.8.13 — fixed in 2.21.8.13
Whatsapp Business: before 2.21.8.13 — fixed in 2.21.8.13

How to fix

Upgrade to a fixed version: Facebook WhatsApp for Android 2.21.8.13; Whatsapp Business 2.21.8.13. Check the vendor advisory for mitigations.

References

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

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