CVE-2018-20655

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-06-14 · updated 2026-06-17
Weakness: CWE-121

Description

When receiving calls using WhatsApp for iOS, a missing size check when parsing a sender-provided packet allowed for a stack-based overflow. This issue affects WhatsApp for iOS prior to v2.18.90.24 and WhatsApp Business for iOS prior to v2.18.90.24.

Affected products

Facebook WhatsApp for Android: before 2.18.90.24 — fixed in 2.18.90.24
Whatsapp Business: before 2.18.90.24 — fixed in 2.18.90.24

How to fix

Upgrade to a fixed version: Facebook WhatsApp for Android 2.18.90.24; Whatsapp Business 2.18.90.24. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/108805
https://www.facebook.com/security/advisories/cve-2018-20655/
http://www.securityfocus.com/bid/108805
https://www.facebook.com/security/advisories/cve-2018-20655/

Get alerted when CVE-2018-20655 or the next vulnerability affects your stack