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CVE-2021-24026

CRITICAL
9.8
CVSS Score
Published: April 6, 2021 at 04:45 PM UTC
Updated: June 17, 2026 at 03:39 AM UTC
2 products affected across 1 vendorWhatsAppWhatsapp Business

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Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

WhatsApp· Whatsapp
95%
v < 2.21.3v < v2.21.3v < v2.21.32
Affected range stops below 2.21.3, so it looks safe — our inference, not a vendor statement
Affected range stops below v2.21.3, so it looks safe — our inference, not a vendor statement
Affected range stops below v2.21.32, so it looks safe — our inference, not a vendor statement
Whatsapp Business· Whatsapp
95%
v < 2.21.3v < 2.21.32v < v2.21.3v < v2.21.32
Affected range stops below 2.21.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.21.32, so it looks safe — our inference, not a vendor statement
Affected range stops below v2.21.3, so it looks safe — our inference, not a vendor statement
Affected range stops below v2.21.32, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.whatsapp.com/security/advisories/2021/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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