CVE-2021-24026

A missing bounds check within the audio decoding pipeline for WhatsApp calls in WhatsApp for...

9.8 Critical

A missing bounds check within the audio decoding pipeline for WhatsApp calls in WhatsApp for Android prior to v2.21.3, WhatsApp Business for Android prior to v2.21.3, WhatsApp for iOS prior to v2.21.32, and WhatsApp Business for iOS prior to v2.21.32 could have allowed an out-of-bounds write.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.40%Up 1.0 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2021-24026
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 10.0 HighAV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-24026
Weakness: CWE-787
Updated: 2026-11-02

EUVDEUVD-2021-10946 No score

Record: EUVD-2021-10946
Updated: 2026-11-03

GitHub AdvisoriesGHSA-36r2-rr2j-2cvx No score

A missing bounds check within the audio decoding pipeline for WhatsApp calls in WhatsApp for...

Record: GHSA-36r2-rr2j-2cvx
Weakness: CWE-787
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-24026 is a critical vulnerability (CVSS 9.8) in Facebook Whatsapp Business For Android, published April 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.40%, the 72nd percentile. No source names a fixed version.