# CVE-2026-76862: Netcore NR255-V OS command argument injection in tcpdump

Source: https://junglewise.ai/threats/cve-2026-76862-netcore-nr255-v-os-command-argument-injection-in-tcpdump  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-76862 · Severity: high · CVSS 8.8 · Published 2026-09-15

The Netcore NR255-V is a residential router that includes network diagnostic tools. A vulnerability in the tcpdump network packet capture functionality allows authenticated attackers to inject arbitrary command-line arguments, potentially leading to remote code execution on the device. This could enable attackers to compromise the router, intercept network traffic, or use it as a pivot point into the customer's home network.

Technologies: [Netcore NR255-V](https://junglewise.ai/threats/technologies/nr255-v). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-76862 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76862 being exploited in the wild.

**How severe is CVE-2026-76862?** High severity, with a CVSS score of 8.8, published 15 September 2026.

**Which products and versions are affected?** Netcore NR255-V 1.5.130703.

**Is there a fix for CVE-2026-76862?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-76862 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-76862?** Check whether you run Netcore NR255-V at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an OS command argument injection (CWE-88) in the tcpdump launch paths across multiple components: ntools_start_set_cgi, ntools_tcpdump_start_set_cgi, exe_default, and ntools_proc. The affected version 1.5.130703 fails to properly sanitize user-supplied input before passing it as arguments to the tcpdump system command. An authenticated attacker can craft malicious arguments to manipulate the executed system command, achieving remote code execution on the device. The attack requires network access and valid authentication credentials; no patch status is currently disclosed.

## Affected products

- Netcore NR255-V 1.5.130703

## Timeline

- 2026-09-04: disclosed
- 2026-09-15: advisory

## References

- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-arg-injection.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-arg-injection.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-os-command-argument-injection-in-nettools-tcpdump-launch-paths](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-os-command-argument-injection-in-nettools-tcpdump-launch-paths)

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