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CVE-2026-111710

Netcore NR256CN through 1.5.140116 Boa Web Server NULL Pointer Dereference DoS

Netcore NR256CN through 1.5.140116 contains a NULL pointer dereference vulnerability in the Boa web server's user_auth() function that allows unauthenticated attackers to crash the server via a malformed Authorization header. Attackers can send a Basic Authorization value lacking a colon, such as one decoding to a single character, to protected routes like /router/get_user_type.cgi to kill the main Boa process and deny management interface access.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Netcore
Products
Nr256cn
CVE-2026-111711

Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()

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.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Vendors
Netcore
Products
Nr256cn
CVE-2026-111712

Netcore NR256CN through 1.5.140116 Authentication Bypass via CGI Path Prefix

Netcore NR256CN through 1.5.140116 contains an authentication bypass vulnerability that allows unauthenticated attackers to reach protected management CGI handlers by prefixing the URI with a public route. Attackers can request paths prefixed with l7_web_auth.cgi or an .ico route to invoke protected management handlers without credentials.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Netcore
Products
Nr256cn
CVE-2026-112016

Netcore NR256CN through 1.5.140116 Unauthenticated Write to Fixed Boa Staging Files

Netcore NR256CN through 1.5.140116 contains an unauthenticated file write vulnerability in the Boa-derived /bin/boa web server that allows remote attackers to overwrite update and restore staging files. Attackers can POST to a non-existent .cgi pathname to write attacker-controlled content into /tmp/boa_temp.update or /tmp/boa_temp.para, tampering with pending firmware updates or configuration restores or causing denial of service.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Netcore
Products
Nr256cn