Samsung’s 2025 Critical Mobile Zero-Day: CVE-2025-21043 Exploited in the Wild
In September 2025, Samsung urgently patched a critical zero-day vulnerability (CVE-2025-21043) impacting its Android devices. The flaw, an out-of-bounds write in the libimagecodec.quram.so library, enabled remote attackers to execute arbitrary code on affected devices. This zero-day had been actively exploited in real-world attacks prior to disclosure and patch release, exposing millions of Galaxy smartphone users to the risk of compromise and potential data theft. Samsung responded by releasing its monthly security updates addressing the vulnerability before widespread exploitation could escalate. This incident underscores the persistent targeting of mobile platforms using advanced zero-day techniques, raising concerns for enterprises reliant on mobile endpoints. As threat actors innovate and focus on mobile ecosystems, rapid patch cycles and vigilant threat monitoring remain essential to protect against evolving exploitation methods.
Kill Chain