CVE-2026-112016: Missing Authentication for Critical Function in Netcore NR256CN
Description
Netcore NR256CN devices up to version 1.5.140116 have an unauthenticated file write vulnerability in the embedded Boa web server. This flaw allows remote attackers to write arbitrary content to temporary files used for firmware updates and configuration restores by sending POST requests to non-existent .cgi paths. Exploitation can lead to tampering with pending firmware updates or configuration restores, or cause denial of service.
CVSS v4.0
Score 6.9medium
Affected software
Netcore
NR256CN
pkg:github/lukadqq/netcore-router-public-refsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-112016 describes an unauthenticated file write vulnerability in the Boa-derived /bin/boa web server component of Netcore NR256CN firmware versions up to 1.5.140116. Attackers can remotely send POST requests to non-existent .cgi endpoints, resulting in arbitrary content being written to /tmp/boa_temp.update or /tmp/boa_temp.para. These files are staging locations for firmware updates and configuration restores, so manipulation can disrupt device operation or compromise update integrity.
Potential Impact
The vulnerability allows unauthenticated remote attackers to overwrite critical staging files related to firmware updates and configuration restores. This can lead to denial of service by corrupting these processes or potentially tampering with firmware or configuration data, impacting device availability and integrity.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the device's management interface to trusted sources to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-18T01:24:03.208Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad4b23c2cdf04f65664e4c1
Added to database: 10/18/2026, 11:49:16 UTC
Last enriched: 10/18/2026, 12:03:50 UTC
Last updated: 10/18/2026, 19:55:33 UTC
Views: 12
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