High severity · published Sep 15, 2026
CVE-2026-76852
Netcore NR268 1.7.121109 Forgeable Firmware Authenticity Check in mtd_write
8.8
CVSS
0.3%
EPSS
No
On KEV
Description
Netcore NR268 firmware version 1.7.121109 has an improper integrity verification flaw in mtd_write allowing forged firmware authenticity checks. Attackers can exploit put_file.cgi and check_image_uuid.c to bypass firmware signature validation and load unauthorized firmware images.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NR
NR268 · Netcore
1.7.121109 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76852
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76852
github.com
https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-firmware-forgery.md
www.vulncheck.com
https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-forgeable-firmware-authenticity-check-in-mtd-write
More from NR268
10.0
CVE-2026-108907
Netcore NR268 CGI Execution user_ok improper authentication
9.9
CVE-2026-108929
Netcore NR268 DDNS DDNSset.cgi execvp argument injection
8.1
CVE-2026-76853
Netcore NR268 1.7.121109 Security Check Bypass in parame_put_file.cgi
7.2
CVE-2026-108906
Netcore NR268 filter_arp_put_file.cgi filter_arp_put_file_cgi out-of-bounds
4.3
CVE-2026-108932
Netcore NR268 DHCP Hostname filter_hosts_dump.cgi eval cross site scripting