CVE-2021-24043

Name: CVE-2021-24043
Creator: NVD / NIST
Published: 2022-02-02T12:15:07.89+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.12%

Last modified Jun 17, 2026

CVE-2021-24043 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A missing bound check in RTCP flag parsing code prior to WhatsApp for Android v2.21.23.2, WhatsApp Business for Android v2.21.23.2, WhatsApp for iOS v2.21.230.6, WhatsApp Business for iOS 2.21.230.7, and WhatsApp Desktop v2.2145.0 could have allowed an out-of-bounds heap read if a user sent a malformed RTCP packet during an established call.. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

Description

A missing bound check in RTCP flag parsing code prior to WhatsApp for Android v2.21.23.2, WhatsApp Business for Android v2.21.23.2, WhatsApp for iOS v2.21.230.6, WhatsApp Business for iOS 2.21.230.7, and WhatsApp Desktop v2.2145.0 could have allowed an out-of-bounds heap read if a user sent a malformed RTCP packet during an established call.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

1.12%

62.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Whatsapp	Whatsapp	2.21.23.2
Whatsapp	Whatsapp	2.21.230.6
Whatsapp	Whatsapp	2.2145.0
Whatsapp	Whatsapp Business	2.21.23.2
Whatsapp	Whatsapp Business	2.21.230.7

References

https://www.whatsapp.com/security/advisories/2021/Not Applicable, Vendor Advisory
https://www.whatsapp.com/security/advisories/2022/Vendor Advisory
https://www.whatsapp.com/security/advisories/2021/Not Applicable, Vendor Advisory

Timeline

Published: Feb 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24043?

How severe is CVE-2021-24043?

CVE-2021-24043 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24043?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24043?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST