CVE-2018-20655 Memory corruption in WhatsApp Business for iOS

What is CVE-2018-20655?

CVE-2018-20655 is a critical memory corruption vulnerability in Facebook WhatsApp Business for iOS, published on 14 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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: CWE-787, CWE-121

Which versions are affected by CVE-2018-20655?

It affects 2 products.

Products include Whatsapp Whatsapp, Whatsapp Whatsapp Business.

How do I fix CVE-2018-20655?

No fix has been published for CVE-2018-20655 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2018-20655 being exploited?

There is no known exploitation of CVE-2018-20655 in the wild and no public exploit code.

Other vulnerabilities in Facebook WhatsApp Business for iOS

• CVE-2019-3568 WhatsApp VOIP Stack Buffer Overflow Exploited Critical 9.8
• CVE-2019-18426 WhatsApp Cross-Site Scripting Exploited High 8.2
• CVE-2025-55177 Meta Platforms WhatsApp Incorrect Authorization Exploited Medium 5.4
• CVE-2022-36934 Integer overflow in WhatsApp Business for Android Critical 9.8
• CVE-2021-24042 Memory corruption in WhatsApp Business for Android Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-99ph-jqg7-g9v9.