Is CVE-2021-34421 actively exploited?

No active exploitation of CVE-2021-34421 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-34421 be exploited remotely?

Yes. CVE-2021-34421 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-34421?

CVE-2021-34421 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2021-34421

CWE-459Published: November 11, 2021· Updated: Jun 17, 2026

4.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-34421 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.