CVE-2021-24041Network attack vector

Memory corruption via missing image blur bounds check

Published Dec 7, 2021 · Updated Aug 3, 2024

Out-of-bounds write in WhatsApp for Android and WhatsApp Business for Android before 2.21.22.7 allows remote attackers to corrupt memory. The image-blurring path omits a bounds check and writes beyond its destination buffer while processing a malicious image. Triggering requires a malicious image to be sent through the app; public details establish memory corruption but not code execution or a specific crash mode.

CVSS severity9.8
Critical
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in WhatsApp for Android and WhatsApp Business for Android before 2.21.22.7 allows remote attackers to corrupt memory. The image-blurring path omits a bounds check and writes beyond its destination buffer while processing a malicious image. Triggering requires a malicious image to be sent through the app; public details establish memory corruption but not code execution or a specific crash mode.

The record

CVE
CVE-2021-24041
Published
Dec 7, 2021
Updated
Aug 3, 2024
Vendor
Meta Platforms, Inc.
Product
WhatsApp for Android
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <v2.21.22.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · WhatsApp for Androidversion=unspecified <v2.21.22.7
Meta Platforms, Inc. · WhatsApp Business for Androidversion=unspecified <v2.21.22.7

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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