KDDI HGW-BL1500HM up to 002.002.003 HTTP Request path traversal

Summaryinfo

A vulnerability was found in KDDI HGW-BL1500HM up to 002.002.003. It has been rated as critical. Affected is an unknown function of the component HTTP Request Handler. This manipulation causes path traversal. This vulnerability is handled as CVE-2025-27716. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in KDDI HGW-BL1500HM up to 002.002.003. Affected by this vulnerability is an unknown function of the component HTTP Request Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. The summary by CVE is:

Improper limitation of a pathname to a restricted directory ('Path Traversal') issue exists in the file/folder listing 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 by a crafted HTTP request to specific functions of the product from a device connected to the LAN side.

The advisory is shared at kddi-tech.com. This vulnerability is known as CVE-2025-27716 since 03/11/2025. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

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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