Is CVE-2021-25435 actively exploited?

No active exploitation of CVE-2021-25435 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-25435 be exploited remotely?

Yes. CVE-2021-25435 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-25435?

CVE-2021-25435 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-25435

CRITICAL

CVE-2021-25435

CWE-20Published: July 8, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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

NVD Source

Technical Analysis

CVE-2021-25435 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.