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CVE-2026-76852— Netcore NR268 1.7.121109 Forgeable Firmware Authenticity Check in mtd_write

Quick assessment

Affected
Netcore NR268
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netcore NR268 固件版本 1.7.121109 在 mtd_write 中存在完整性校验不当的缺陷，使得伪造的固件真实性检查成为可能。攻击者可以利用 put_file.cgi 和 check_image_uuid.c 绕过固件签名验证，从而加载未授权的固件镜像。

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1190.005
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I. Basic Information for CVE-2026-76852

Vulnerability Information
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Vulnerability Title
Netcore NR268 1.7.121109 Forgeable Firmware Authenticity Check in mtd_write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netcore NR268 1.7.121109 -

II. Public POCs for CVE-2026-76852

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III. Intelligence Information for CVE-2026-76852

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Vendor Advisories for CVE-2026-76852 (1)

Proof of Concept for CVE-2026-76852 (1)

Same Patch Batch · Netcore · 2026-09-15 · 25 CVEs total

CVE-2026-76860 8.8 HIGH Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in wake_up_set.cgi via MAC and ID T
CVE-2026-76862 8.8 HIGH Netcore NR255-V 1.5.130703 OS Command Argument Injection in Nettools tcpdump Launch Paths
CVE-2026-76861 8.8 HIGH Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in ntools_tcpdump_start_set.cgi
CVE-2026-76853 8.1 HIGH Netcore NR268 1.7.121109 Security Check Bypass in parame_put_file.cgi
CVE-2026-76856 8.1 HIGH Netcore NR255-V 1.5.130703 Cross-Site Request Forgery in WAN/LAN Configuration Endpoints
CVE-2026-76866 7.2 HIGH Netcore NR255-V 1.5.130703 OS Command Argument Injection via Unquoted DDNS Parameters
CVE-2026-76869 7.2 HIGH Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in reboot_timer_set.cgi
CVE-2026-76870 7.1 HIGH Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validation
CVE-2026-92256 6.5 MEDIUM Netcore NR255-V 1.5.130703 IPsec PSK and RSA Key Disclosure via l2tpd_config_show.cgi Read
CVE-2026-76854 6.5 MEDIUM Netcore NR255-V 1.5.130703 Sensitive Information Disclosure via l7_web_auth_user_show.cgi
CVE-2026-76871 6.5 MEDIUM Netcore NR255-V 1.5.130703 Sensitive Information Disclosure via VPN Read Handlers
CVE-2026-76859 6.5 MEDIUM Netcore NR255-V 1.5.130703 Sensitive Information Disclosure via user_pass_show.cgi
CVE-2026-76855 6.5 MEDIUM Netcore NR255-V 1.5.130703 Cross-User Session Disclosure via Audit Endpoints
CVE-2026-76857 6.5 MEDIUM Netcore NR255-V 1.5.130703 Plaintext DDNS Credential Disclosure via ddns_wan_list_show.cgi
CVE-2026-92255 5.4 MEDIUM Netcore NR255-V 1.5.130703 Out-of-Bounds Read in filter_arp_put_file.cgi via String API Mi
CVE-2026-76867 5.4 MEDIUM Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting in Route/NAT Configuration CGI Hand
CVE-2026-76872 5.4 MEDIUM Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting via DHCP/ACL Management Pages
CVE-2026-92257 5.4 MEDIUM Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting in L7 Content Management via eval()
CVE-2026-76873 5.2 MEDIUM Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting via DHCP and ARP Hostname Fields
CVE-2026-76865 4.9 MEDIUM Netcore NR255-V 1.5.130703 NULL Pointer Dereference via Unchecked atoi() in QoS Setter Han

Showing top 20 of 25 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: NR268
Same vendor: Netcore
Same weakness: CWE-354

V. Comments for CVE-2026-76852

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