File Station 5 Buffer Overflow Vulnerabilities

Stack-based buffer overflow in QNAP File Station 5 allows unauthenticated remote attackers to corrupt process memory or crash the file management service when a victim user passively interacts with a crafted input. Affected versions are all File Station 5 releases prior to 5.5.6.5243, running on QNAP NAS devices accessible over the network. No public exploit code has been identified and this CVE is not listed in the CISA KEV catalog; QNAP has confirmed and released a fix in version 5.5.6.5243 via advisory QSA-26-32.

Stack-based buffer overflow in QNAP File Station 5 enables remote unauthenticated attackers to corrupt memory or destabilize processes through a network-accessible attack path requiring only passive user interaction. Affected versions are all releases prior to 5.5.6.5243; QNAP's own security team (security@qnapsecurity.com.tw) discovered and disclosed the issue via advisory QSA-26-27. No public exploit code exists and the vulnerability is not listed in CISA KEV; however, the unauthenticated network attack vector lowers the bar for opportunistic targeting of QNAP NAS deployments.