What’s Vulnerable › Vulnerabilities

CVE-2021-25434

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-08 · updated 2026-06-17
• Weakness: CWE-20

Description

Improper input validation vulnerability in Tizen bootloader prior to Firmware update JUL-2021 Release allows arbitrary code execution using param partition in wireless firmware download mode.

Affected products

• Samsung Mobile Tizen wearable devices: before 5.5 — fixed in 5.5

How to fix

Upgrade to a fixed version: Samsung Mobile Tizen wearable devices 5.5. Check the vendor advisory for mitigations.

References

• https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=7
• https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=7

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