CVE-2026-76870: Netcore NR255-V

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c.

Affected products

• Netcore NR255-V: version 1.5.130703 only

Published 2026-09-15. Last modified 2026-09-16.