Buffer overflow in Samsung Blockchain Keystore
CVE-2025-21020
Out-of-bounds write in creating bitmap images in Blockchain Keystore prior to version 1.3.17.2 allows local privileged attackers to write out-of-bounds memory.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (2.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Samsung Blockchain_keystore
- Samsung Mobile Blockchain Keystore — versions 1.3.17.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- mobile.security@samsung.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-21020?
- CVE-2025-21020 is a medium-severity vulnerability in Samsung Blockchain Keystore, classified under Out-of-bounds Write. CVSS score: 5.7/10. Published 2025-08-06.
- How severe is CVE-2025-21020?
- Medium severity. CVSS v3 base score is 5.7 out of 10.
- Is CVE-2025-21020 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.