CVE-2026-76852: Improper Validation of Integrity Check Value in Netcore NR268
CVE-2026-76852 is a high-severity vulnerability in Netcore NR268 firmware version 1.7.121109. It involves improper validation of the integrity check value in the mtd_write function, which allows attackers to bypass firmware signature verification. Exploitation can occur via put_file.cgi and check_image_uuid.c, enabling unauthorized firmware images to be loaded.
AI Analysis
Technical Summary
The Netcore NR268 firmware version 1.7.121109 contains a flaw in the integrity verification process within the mtd_write function. This flaw allows attackers to forge firmware authenticity checks by exploiting the put_file.cgi and check_image_uuid.c components. As a result, attackers can bypass the firmware signature validation mechanism and load unauthorized firmware images onto the device. The CVSS 4.0 base score is 8.7, indicating a high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impacts on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an attacker to bypass firmware signature validation and load unauthorized firmware images. This can lead to compromise of device integrity, potentially allowing persistent unauthorized control or disruption of device operations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to the affected device interfaces (such as put_file.cgi) to trusted users only.
CVE-2026-76852: Improper Validation of Integrity Check Value in Netcore NR268
Description
CVE-2026-76852 is a high-severity vulnerability in Netcore NR268 firmware version 1.7.121109. It involves improper validation of the integrity check value in the mtd_write function, which allows attackers to bypass firmware signature verification. Exploitation can occur via put_file.cgi and check_image_uuid.c, enabling unauthorized firmware images to be loaded.
CVSS v4.0
Score 8.7high
Affected software
Netcore
NR268
pkg:github/draw-ctf/netcore-router-public-refsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Netcore NR268 firmware version 1.7.121109 contains a flaw in the integrity verification process within the mtd_write function. This flaw allows attackers to forge firmware authenticity checks by exploiting the put_file.cgi and check_image_uuid.c components. As a result, attackers can bypass the firmware signature validation mechanism and load unauthorized firmware images onto the device. The CVSS 4.0 base score is 8.7, indicating a high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impacts on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an attacker to bypass firmware signature validation and load unauthorized firmware images. This can lead to compromise of device integrity, potentially allowing persistent unauthorized control or disruption of device operations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to the affected device interfaces (such as put_file.cgi) to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-19T21:47:08.935Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9c06c55bf5e2cf56f8239
Added to database: 09/15/2026, 22:02:20 UTC
Last enriched: 09/15/2026, 22:24:17 UTC
Last updated: 09/16/2026, 03:17:24 UTC
Views: 4
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