CVE-2021-34421

Name: CVE-2021-34421
Creator: NVD / NIST
Published: 2021-11-11T23:15:09.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2021-34421 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS Probability

0.69%

48.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-459

Affected Software

Vendor	Product	Versions
Keybase	Keybase	5.8.0

References

https://explore.zoom.us/en/trust/security/security-bulletinThird Party Advisory
https://explore.zoom.us/en/trust/security/security-bulletinThird Party Advisory

Timeline

Published: Nov 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34421?

How severe is CVE-2021-34421?

CVE-2021-34421 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34421?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34421?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST