Auth bypass in Netcore Nr256cn
CVE-2026-112016
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.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144… (technical-description, third-party-advisory)
- www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-unauthenticated… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112016?
- CVE-2026-112016 is a medium-severity vulnerability in Netcore Nr256cn, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-10-18.
- How severe is CVE-2026-112016?
- Medium severity. CVSS v3 base score is 6.5 out of 10.