CVE-2026-76861 Netcore CVE debrief

Who should care

Network administrators, security teams, and IT professionals responsible for Netcore NR255-V devices, especially those using version 1.5.130703, should assess exposure and prioritize remediation.

Why it matters

CVE-2026-76861 is a high-severity vulnerability in Netcore NR255-V devices that could allow arbitrary code execution. Network administrators and security teams should assess exposure, prioritize remediation, and implement compensating controls to prevent exploitation.

• Potential for arbitrary code execution requires immediate attention and verification
• Exposure of network devices to potential exploitation
• Need for input validation and sanitization to prevent similar vulnerabilities
• Verification of vendor-provided patches or updates for affected versions

Technical summary

The vulnerability exists in the ntools_tcpdump_start_set.cgi endpoint of Netcore NR255-V version 1.5.130703 due to an unsized sprintf call when processing form values. This could potentially allow an attacker to execute arbitrary code by submitting crafted input. The vulnerability is considered high-severity with a CVSS score of 8.7. The CVE record and NVD entry provide details on the vulnerability, but specific details about affected versions and remediation are limited. The vulnerability class is a stack-based buffer overflow, and the likely operational impact is potential arbitrary code execution.

Defensive priority

High priority for network devices and systems using Netcore NR255-V version 1.5.130703

Recommended defensive actions

• Review and restrict access to the ntools_tcpdump_start_set.cgi endpoint
• Implement input validation and sanitization for form values
• Monitor for and apply vendor-provided patches or updates
• Consider compensating controls such as web application firewalls
• Perform a thorough review of network devices and systems using Netcore NR255-V version 1.5.130703
• Verify the effectiveness of implemented patches or updates
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.7 and HIGH severity. However, specific details about affected versions and remediation are limited. The vulnerability exists in the ntools_tcpdump_start_set.cgi endpoint of Netcore NR255-V version 1.5.130703 due to an unsized sprintf call when processing form values. This could potentially allow an attacker to execute arbitrary code by submitting crafted input. The CVE Program record and NVD detail page offer additional information. The de

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.