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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (34.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Netcore Nr255-V — versions 1.5.130703
Weakness classification (CWE)
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-out-of-bounds-read-in-m… (third-party-advisory)
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.