CVE-2026-76861CWE-121

CVE-2026-76861

High · published September 16, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
51.7
In the wild
Unconfirmed
What it is

Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in ntools_tcpdump_start_set.cgi caused by an unsized sprintf call when processing form values. An attacker can submit crafted input to this cgi endpoint to overflow the stack buffer and potentially execute arbitrary code.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00676 · 51.7th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-09-16T02:17Z
References (2)
https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-overflow.md · [email protected]https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-ntools-tcpdump-start-set-cgi · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 1%
    epss
  • 15 SEP 21:57Z
    Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in ntools_tcpdump_start_set.cgi
    cvelistv5