---
id: "CVE-2019-3568"
kind: "vulnerability"
aliases: ["CVE-2019-3568"]
title: "Meta Platforms WhatsApp: WhatsApp VOIP Stack Buffer Overflow Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.30076
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Meta Platforms WhatsApp", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["end-users", "exploited", "mobile", "vendor", "whatsapp"]
not_affected_if: ["fully-patched-app"]
published_at: "2019-05-14T20:29:03+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-3568", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2019-3568", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3568", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Meta Platforms WhatsApp: WhatsApp VOIP Stack Buffer Overflow Vulnerability

A buffer overflow in the WhatsApp VoIP stack lets an attacker run code on a target's phone by sending a specially crafted series of RTCP packets to their number. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Meta Platforms WhatsApp affected ? fixed ?

## Fix

Update WhatsApp to the latest version through the vendor's app store channel, as CISA directs (Apply updates per vendor instructions).

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-3568
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2019-3568
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2019-3568

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_