Out-of-bounds write in Meta WhatsApp Business for iOS
Priority MEDIUM 45CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01403 72nd percentileScored 2026-11-07
Fix Fixed WhatsApp Business for iOS (Facebook): v2.21.32WhatsApp for iOS (Facebook): v2.21.32+2 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Meta | WhatsApp Business for iOS | before v2.21.32 | v2.21.32 | Patch available | CNA |
| Meta | WhatsApp for iOS | before v2.21.32 | v2.21.32 | Patch available | CNA |
| Meta | WhatsApp Business for Android | before v2.21.3 | v2.21.3 | Patch available | CNA |
| Meta | WhatsApp for Android | before v2.21.3 | v2.21.3 | Patch available | CNA |
- WhatsApp Business for iOS VendorMeta Affected before v2.21.32 Fixed in v2.21.32 Patch available CNA
- WhatsApp for iOS VendorMeta Affected before v2.21.32 Fixed in v2.21.32 Patch available CNA
- WhatsApp Business for Android VendorMeta Affected before v2.21.3 Fixed in v2.21.3 Patch available CNA
- WhatsApp for Android VendorMeta Affected before v2.21.3 Fixed in v2.21.3 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:android:*:* | before 2.21.3 | Vulnerable | |
| cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:* | before 2.21.3 | Vulnerable | |
| cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:android:*:* | before 2.21.3 | Vulnerable | |
| cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:* | before 2.21.32 | Vulnerable |
- cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:android:*:* Versions before 2.21.3 Vulnerable ·WhatsApp
- cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:* Versions before 2.21.3 Vulnerable ·WhatsApp
- cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:android:*:* Versions before 2.21.3 Vulnerable ·WhatsApp
- cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:* Versions before 2.21.32 Vulnerable ·WhatsApp
Remediation
- Fix · CNA WhatsApp Business for iOS (Facebook) Fixed in v2.21.32
- Fix · CNA WhatsApp for iOS (Facebook) Fixed in v2.21.32
- Fix · CNA WhatsApp Business for Android (Facebook) Fixed in v2.21.3
- Fix · CNA WhatsApp for Android (Facebook) Fixed in v2.21.3
Timeline
- 2026-10-02 Threatist record created from CVE-2021-24026
- 2026-10-03 Alias added: GHSA-36r2-rr2j-2cvx
References
More Meta vulnerabilities
- TI-2025-34861 Deserialization of untrusted data in Meta react-server-dom-webpack KEVCVSS 3.1CRITICAL 10.0
- TI-2019-02633 Heap-based buffer overflow in Meta WhatsApp for Android KEVCVSS 3.1CRITICAL 9.8
- TI-2019-13416 Cross-site scripting in Meta WhatsApp Desktop KEVCVSS 3.1HIGH 8.2
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2025-34857 Incorrect authorization in Meta WhatsApp Desktop for Mac KEVCVSS 3.1MEDIUM 5.4
- TI-2025-34863 Deserialization of untrusted data in Meta react-server-dom-webpack CVSS 3.1HIGH 7.5
Sources
- CVE-2021-24026 · CVE Program
- CVE-2021-24026 · NVD
- FIRST EPSS
- GHSA-36r2-rr2j-2cvx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences