CVE-2019-3568 WhatsApp VOIP Stack Buffer Overflow Vulnerability
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.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 19 Apr 2022.
- Rated Critical severity (CVSS 9.8, scored by CISA).
- It has been in the catalogue for 1,662 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
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 Versions
| Product | Versions |
|---|---|
| Facebook WhatsApp for Android | 2.19.134 unspecified to before 2.19.134 |
| Facebook WhatsApp Business for Android | 2.19.44 unspecified to before 2.19.134 |
| Facebook WhatsApp for iOS | 2.19.51 unspecified to before 2.19.51 |
| Facebook WhatsApp Business for iOS | 2.19.51 unspecified to before 2.19.51 |
| Facebook WhatsApp for Windows Phone | 2.18.348 unspecified to before 2.18.348 |
| Facebook WhatsApp for Tizen | 2.18.15 unspecified to before 2.18.15 |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for Meta Platforms WhatsApp. Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
- 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
Vendor Advisories
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
Our attack surface and vulnerability teams can check your internet-facing estate for CVE-2019-3568 and every other exploited flaw on the list.