KDDI HGW-BL1500HM up to 002.002.003 HTTP Request path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in KDDI HGW-BL1500HM up to 002.002.003. Affected by this vulnerability is an unknown functionality of the component HTTP Request Handler. Such manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2025-27718. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in KDDI HGW-BL1500HM up to 002.002.003. Affected by this issue is an unknown functionality of the component HTTP Request Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Improper limitation of a pathname to a restricted directory ('Path Traversal') issue exists in the file upload process of the USB storage file-sharing function of HGW-BL1500HM Ver 002.002.003 and earlier. If this vulnerability is exploited, the product's files may be obtained and/or altered or arbitrary code may be executed by a crafted HTTP request to specific functions of the product from a device connected to the LAN side.

The advisory is available at kddi-tech.com. This vulnerability is handled as CVE-2025-27718 since 03/11/2025. The exploitation is known to be easy. The attack may be launched remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

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

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Productinfo

Vendor

• KDDI

Name

• HGW-BL1500HM

Version

• 002.002.003

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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