Exploited. On CISA's list since 2022-04-19.

WhatsApp VOIP Stack Buffer Overflow Vulnerability

CVE-2019-3568 · Meta Platforms WhatsApp · Published 2019-05-14

How bad would it be?

9.8 out of 10

CVSS rates it critical: about as damaging as flaws get.

How likely is it to be used?

30%

Estimated chance of exploitation in the next 30 days, higher than 98% of all scored flaws (EPSS, 2026-10-29).

Is it already being used?

Yes

CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1634 days ago (2022-05-10).

What CISA says to do

Apply updates per vendor instructions.

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.

nvd.nist.gov

What the flaw 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.

From the NVD.

Learn this

Explore this week’s weaknesses and all learning topics

Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.

Heap buffer overflow

A write runs past allocated heap storage and can damage neighbouring data.

CWE-122 · CISA KEV; NVD record: cve-assign@fb.com

Video course · Free course. C programming and memory concepts are useful; covers several weakness types.

Watch the course at OpenSecurityTraining2 How it is prevented

Out-of-bounds write

A program writes outside the memory region it is allowed to use.

CWE-787 · NVD record: nvd@nist.gov

Video course · Free course. C programming and memory concepts are useful; covers several weakness types.

Watch the course at OpenSecurityTraining2 How it is prevented

CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.

On SentryFeed

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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.