---
title: "CVE-2026-76866: Netcore NR255-V - Command Injection"
description: "Netcore NR255-V firmware 1.5.130703 contains a command injection caused by unquoted user-supplied DDNS input in DDNSset_cgi.c and ddns_Proc.c, letting attackers execute root-run commands, exploit requires crafted DDNS input."
url: https://panop.io/threat-heartbeat/CVE-2026-76866/
---

# CVE-2026-76866 Netcore NR255-V - Command Injection

Netcore NR255-V firmware 1.5.130703 contains a command injection caused by unquoted user-supplied DDNS input in DDNSset\_cgi.c and ddns\_Proc.c, letting attackers execute root-run commands, exploit requires crafted DDNS input.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.57% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76866)

## Details

Type

Command Injection

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-88](https://cwe.mitre.org/data/definitions/88.html)

## Vendor fix

Update to the latest firmware version that fixes this issue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76866](https://nvd.nist.gov/vuln/detail/CVE-2026-76866)
- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-ddns-argv-injection.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-ddns-argv-injection.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-os-command-argument-injection-via-unquoted-ddns-parameters](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-os-command-argument-injection-via-unquoted-ddns-parameters)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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