CVE-2021-42987

CVE-2021-42987 is an Integer Overflow vulnerability affecting Eltima USB Network Gate versions 7.0.1370 through 9.2.2420. This flaw, residing in the IOCTL Handler 0x22001B, allows a local attacker to execute arbitrary code in kernel mode or trigger a denial of service through memory corruption and OS crashes using a specially crafted I/O Request Packet. With a CVSS score of 8.8 (HIGH), it has a low attack complexity and requires local privileges, but can lead to high impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and it has received limited community discussion and media coverage, though it was mentioned in an article about 27 flaws in USB-over-network SDKs.