CVE-2020-1891 Memory corruption in WhatsApp Android

What is CVE-2020-1891?

CVE-2020-1891 is a critical memory corruption vulnerability in Facebook WhatsApp Android, published on 3 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A user controlled parameter used in video call in WhatsApp for Android prior to v2.20.17, WhatsApp Business for Android prior to v2.20.7, WhatsApp for iPhone prior to v2.20.20, and WhatsApp Business for iPhone prior to v2.20.20 could have allowed an out-of-bounds write on 32-bit devices.

Weakness: CWE-787

Which versions are affected by CVE-2020-1891?

It affects 2 products.

Products include Whatsapp Whatsapp, Whatsapp Whatsapp Business.

How do I fix CVE-2020-1891?

No fix has been published for CVE-2020-1891 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-2020-1891 being exploited?

There is no known exploitation of CVE-2020-1891 in the wild and no public exploit code.

Other vulnerabilities in Facebook WhatsApp Android

• 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-fmf2-2478-rv56.