CVE-2026-111711
CRITICAL
NVD
CVSS Score
9.8
Severity
CRITICAL
Published
Oct 16, 2026
Vendor
unknown
Description
Netcore NR256CN through 1.5.140116 contains a pre-authentication stack overflow vulnerability in the Boa web server's user_ok() function, which copies Basic-auth usernames with unbounded strcpy() calls into 64-byte stack buffers. Unauthenticated attackers can send a username longer than 63 bytes to any protected /router/*.cgi route to crash the main Boa process or potentially execute code.