CVE-2026-76861: Netcore NR255-V

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in ntools_tcpdump_start_set.cgi caused by an unsized sprintf call when processing form values. An attacker can submit crafted input to this cgi endpoint to overflow the stack buffer and potentially execute arbitrary code.

Affected products

• Netcore NR255-V: version 1.5.130703 only

Published 2026-09-15. Last modified 2026-09-21.