---
title: "CVE-2026-76861: Netcore NR255-V - Buffer Overflow"
description: "Netcore NR255-V 1.5.130703 contains a stack-based buffer overflow caused by an unsized sprintf call in ntools_tcpdump_start_set.cgi, letting attackers execute arbitrary code remotely, exploit requires crafted input to the CGI endpoint."
url: https://panop.io/threat-heartbeat/CVE-2026-76861/
---

# CVE-2026-76861 Netcore NR255-V - Buffer Overflow

Netcore NR255-V 1.5.130703 contains a stack-based buffer overflow caused by an unsized sprintf call in ntools\_tcpdump\_start\_set.cgi, letting attackers execute arbitrary code remotely, exploit requires crafted input to the CGI endpoint.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.68% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76861)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version.

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-2026-76861](https://nvd.nist.gov/vuln/detail/CVE-2026-76861)
- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-overflow.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-overflow.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-ntools-tcpdump-start-set-cgi](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-ntools-tcpdump-start-set-cgi)

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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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