TI-2026-76168 Aliases CVE-2026-112016 GHSA-498m-g7jx-66f7

Unauthenticated file write in Netcore NR256CN Boa web server

LOW 30CWE-306Published 2026-10-18 · Updated 2026-10-19

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Netcore NR256CN through 1.5.140116 contains an unauthenticated file write flaw in its Boa-derived /bin/boa web server. Missing authentication for a critical function (CWE-306) lets remote attackers POST to a non-existent .cgi pathname and overwrite update and restore staging files. An attacker can tamper with pending firmware updates or configuration restores, or cause a denial of service, without credentials.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00335 26th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Netcore	NR256CN	up to 1.5.140116	—	No fix listed	CNA

NR256CN VendorNetcore Affected up to 1.5.140116 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Netcore NR256CN.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-18 Threatist record created from CVE-2026-112016
2026-10-18 Alias added: GHSA-498m-g7jx-66f7
2026-10-19 CISA SSVC decision points changed
2026-10-19 Priority changed: MEDIUM → LOW

References

Advisory 1

https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-fixed-tmp-sink-write.md

TI-2026-71052 Improper authentication in Netcore NR268 CGI Execution CVSS 4.0CRITICAL 10.0
TI-2026-65286 Netcore NAP930 Network Tools CGI network_tools eval os command injection CVSS 4.0CRITICAL 10.0
TI-2026-65110 Netcore NR289-GE boa_temp process_request missing authentication CVSS 4.0CRITICAL 10.0
TI-2026-65109 Netcore NR289-GE CGI set_ntp_server_ip.cgi system os command injection CVSS 4.0CRITICAL 10.0
TI-2026-65108 Netcore NR289-GE Location Time location_time.cgi system os command injection CVSS 4.0CRITICAL 10.0
TI-2026-65105 Netcore NR289-GE CGI ap_ip.cgi system os command injection CVSS 4.0CRITICAL 10.0

See all 60 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences