VULNERABILITY INTELLIGENCE

CVE-2018-20655

CVSS score9.8 CRITICAL

EPSS probability2.20%

CISA KEVNot currently listed

Published2019-06-14

Last modified2026-06-17

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

Description

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.

Weakness classification

CWE-121: Stack-based Buffer Overflow
CWE-787: Out-of-bounds Write

Primary references

cve-assign@fb.com — Third Party Advisory, VDB Entry
cve-assign@fb.com — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory