KDDI HGW-BL1500HM up to 002.002.003 HTTP Request path traversal

Summaryinfo

A vulnerability identified as critical has been detected in KDDI HGW-BL1500HM up to 002.002.003. Affected by this issue is some unknown functionality of the component HTTP Request Handler. Performing a manipulation results in path traversal. This vulnerability was named CVE-2025-27726. The attack needs to be approached within the local network. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in KDDI HGW-BL1500HM up to 002.002.003. This affects some unknown functionality of the component HTTP Request Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality. The summary by CVE is:

Improper limitation of a pathname to a restricted directory ('Path Traversal') issue exists in the file download 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.

It is possible to read the advisory at kddi-tech.com. This vulnerability is uniquely identified as CVE-2025-27726 since 03/11/2025. The exploitability is told to be easy. The attack can only be initiated within the local network. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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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Threat Intelligenceinfo

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Entryinfo

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