Out-of-bounds Read in Netcore Nr255-V

CVE-2026-76870

Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-76870?
CVE-2026-76870 is a high-severity vulnerability in Netcore Nr255-V, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-09-15.
How severe is CVE-2026-76870?
High severity. CVSS v3 base score is 7.1 out of 10.