CVE-2018-20655

When receiving calls using WhatsApp for iOS, a missing size check when parsing a sender-provided packet allowed for a stack-based overflow. This issue affects WhatsApp for iOS prior to v2.18.90.24 and WhatsApp Business for iOS prior to v2.18.90.24.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
http://www.securityfocus.com/bid/108805	Third Party Advisory VDB Entry
https://www.facebook.com/security/advisories/cve-2018-20655/	Third Party Advisory
http://www.securityfocus.com/bid/108805	Third Party Advisory VDB Entry
https://www.facebook.com/security/advisories/cve-2018-20655/	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:whatsapp:whatsapp::::::iphone_os::*
	cpe:2.3:a:whatsapp:whatsapp_business::::::iphone_os::*

History

03 Sep 2025, 17:36

Type	Values Removed	Values Added
First Time		Whatsapp whatsapp Business
CPE	cpe:2.3:a:whatsapp:whatsapp:::::business:iphone_os::	cpe:2.3:a:whatsapp:whatsapp_business::::::iphone_os::*

Information

Published : 2019-06-14 17:29

Updated : 2025-09-03 17:36

NVD link : CVE-2018-20655

Mitre link : CVE-2018-20655

CVE.ORG link : CVE-2018-20655

JSON object : View

Products Affected

whatsapp

whatsapp_business
whatsapp

CWE

CWE-121

Stack-based Buffer Overflow

CWE-787

Out-of-bounds Write

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