CVE-2023-21509

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-04 · updated 2026-06-17
Weakness: CWE-787

Description

Out-of-bounds Write vulnerability while processing BC_TUI_CMD_UPDATE_SCREEN in bc_tui trustlet from Samsung Blockchain Keystore prior to version 1.3.12.1 allows local attacker to execute arbitrary code.

Affected products

Samsung Mobile Samsung Blockchain Keystore: before 1.3.12.1 — fixed in 1.3.12.1

How to fix

Upgrade to a fixed version: Samsung Mobile Samsung Blockchain Keystore 1.3.12.1. Check the vendor advisory for mitigations.

References

https://security.samsungmobile.com/serviceWeb.smsb?year=2023&month=05
https://security.samsungmobile.com/serviceWeb.smsb?year=2023&month=05

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