High severity · published Oct 16, 2026
CVE-2026-111710
Netcore NR256CN through 1.5.140116 Boa Web Server NULL Pointer Dereference DoS
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NR
NR256CN · Netcore
through 1.5.140116 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111710
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111710
github.com
https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-basic-auth-null-deref.md
www.vulncheck.com
https://www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-boa-web-server-null-pointer-dereference-dos
More from NR256CN
9.8
CVE-2026-111711
Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()
6.5
CVE-2026-112016
Netcore NR256CN through 1.5.140116 Unauthenticated Write to Fixed Boa Staging Files
6.5
CVE-2026-111712
Netcore NR256CN through 1.5.140116 Authentication Bypass via CGI Path Prefix