CVE-2019-3568: WhatsApp VOIP Stack Buffer Overflow Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-04-19. EPSS: 30.1% chance of exploitation in the next 30 days.

A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.

Affected products

• WhatsApp WhatsApp: before 2.18.15 (fixed in 2.18.15); before 2.18.348 (fixed in 2.18.348); before 2.19.51 (fixed in 2.19.51); before 2.19.134 (fixed in 2.19.134)
• WhatsApp WhatsApp Business: before 2.19.44 (fixed in 2.19.44); before 2.19.51 (fixed in 2.19.51)

Published 2019-05-14. Last modified 2026-06-17.