CVE-2026-76866: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') in Netcore NR255-V
CVE-2026-76866 is a high-severity vulnerability in Netcore NR255-V firmware version 1.5.130703. It involves improper neutralization of argument delimiters in command lines constructed from unquoted user-supplied DDNS input, allowing command argument injection with root privileges. This flaw exists in the DDNSset_cgi.c and ddns_Proc.c components. Exploitation could enable attackers to execute arbitrary commands as root on the affected device.
AI Analysis
Technical Summary
The Netcore NR255-V firmware version 1.5.130703 contains a vulnerability where root-run command lines are built from unquoted user-supplied DDNS input in the DDNSset_cgi.c and ddns_Proc.c components. This improper neutralization of argument delimiters (argument injection) allows attackers to inject additional command arguments executed with root privileges, potentially leading to full system compromise. The CVSS 4.0 score is 8.6, indicating a high severity with network attack vector, low complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary commands with root privileges on the affected Netcore NR255-V device, potentially compromising the entire system's confidentiality, integrity, and availability.
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 access to the DDNS configuration interface to trusted users only and monitor for suspicious activity related to DDNS input.
CVE-2026-76866: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') in Netcore NR255-V
Description
CVE-2026-76866 is a high-severity vulnerability in Netcore NR255-V firmware version 1.5.130703. It involves improper neutralization of argument delimiters in command lines constructed from unquoted user-supplied DDNS input, allowing command argument injection with root privileges. This flaw exists in the DDNSset_cgi.c and ddns_Proc.c components. Exploitation could enable attackers to execute arbitrary commands as root on the affected device.
CVSS v4.0
Score 8.6high
Affected software
Netcore
NR255-V
pkg:github/draw-ctf/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
The Netcore NR255-V firmware version 1.5.130703 contains a vulnerability where root-run command lines are built from unquoted user-supplied DDNS input in the DDNSset_cgi.c and ddns_Proc.c components. This improper neutralization of argument delimiters (argument injection) allows attackers to inject additional command arguments executed with root privileges, potentially leading to full system compromise. The CVSS 4.0 score is 8.6, indicating a high severity with network attack vector, low complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary commands with root privileges on the affected Netcore NR255-V device, potentially compromising the entire system's confidentiality, integrity, and availability.
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 access to the DDNS configuration interface to trusted users only and monitor for suspicious activity related to DDNS input.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-19T21:47:08.936Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9c06e55bf5e2cf56f8247
Added to database: 09/15/2026, 22:02:22 UTC
Last enriched: 09/15/2026, 22:25:17 UTC
Last updated: 09/15/2026, 23:21:42 UTC
Views: 3
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