CVE-2025-21021 Memory corruption in Blockchain Keystore

Medium 5.7 Published 6 Aug 2025 Updated 26 Feb 2026

Local privileged attackers can exploit an out-of-bounds write in the pinpad drawing to corrupt memory, potentially leading to code execution or privilege escalation.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-21021?

CVE-2025-21021 is a medium-severity memory corruption vulnerability in Samsung Mobile Blockchain Keystore, published on 6 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Out-of-bounds write in drawing pinpad in Blockchain Keystore prior to version 1.3.17.2 allows local privileged attackers to write out-of-bounds memory.

Weakness: CWE-787

Which versions are affected by CVE-2025-21021?

It affects 1 product.

Products include Samsung Blockchain Keystore.

How do I fix CVE-2025-21021?

No fix has been published for CVE-2025-21021 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-21021 being exploited?

There is no known exploitation of CVE-2025-21021 in the wild and no public exploit code.

Sources

Also known as GHSA-gmg7-p663-wm59.