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Vulnerability record · CVE-2018-20655 · published 14 June 2019

CVE-2018-20655: Whatsapp stack-based buffer overflow vulnerability

Whatsapp · Whatsapp

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.

9.8 CVSS 3.1 Critical EPSS 2.2% · top 17.8% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-20655), CISA KEV, FIRST EPSS (scores of 2026-10-18). This page is refreshed as NVD updates the record.