Netcore NR255-V 1.5.130703 put_file_cgi.c mtd_write out-of-bounds

Summaryinfo

A vulnerability, which was classified as critical, has been found in Netcore NR255-V 1.5.130703. This affects the function mtd_write of the file put_file_cgi.c. The manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2026-76870. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Netcore NR255-V 1.5.130703 and classified as critical. This issue affects the function mtd_write of the file put_file_cgi.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-76870 since 08/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Netcore

Name

• NR255-V

Version

• 1.5.130703

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion