What is CVE-2026-76869?

CVE-2026-76869 is a high-severity vulnerability in Netcore Nr255-V, classified under Stack-based Buffer Overflow. CVSS score: 7.2/10. Published 2026-09-15.

How severe is CVE-2026-76869?

High severity. CVSS v3 base score is 7.2 out of 10.

Buffer overflow in Netcore Nr255-V

CVE-2026-76869

Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in reboot_timer_set.cgi caused by improper sscanf token parsing. Attackers can exploit this flaw by submitting crafted input to the affected endpoint to corrupt stack memory.

Vulnerability class: Buffer Overflow

Published 2026-09-15 · last modified 2026-09-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.3th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Netcore Nr255-V — versions 1.5.130703

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr2… (third-party-advisory)
www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-over… (third-party-advisory)

Frequently asked questions

What is CVE-2026-76869?: CVE-2026-76869 is a high-severity vulnerability in Netcore Nr255-V, classified under Stack-based Buffer Overflow. CVSS score: 7.2/10. Published 2026-09-15.
How severe is CVE-2026-76869?: High severity. CVSS v3 base score is 7.2 out of 10.