[Japanese]

JVNDB-2025-000018

Multiple vulnerabilities in home gateway HGW-BL1500HM

Overview

Home gateway HGW-BL1500HM provided by KDDI CORPORATION contains multiple vulnerabilities listed below.
  • Stored cross-site scripting in the NickName registration screen (CWE-79) - CVE-2025-27567
  • Stored cross-site scripting in the USB storage file-sharing function (CWE-79) - CVE-2025-27574
  • Path traversal in the file/folder listing process of the USB storage file-sharing function (CWE-22) - CVE-2025-27716
  • Path traversal in the file upload process of the USB storage file-sharing function (CWE-22) - CVE-2025-27718
  • Path traversal in the file download process of the USB storage file-sharing function (CWE-22) - CVE-2025-27726
  • Path traversal in the file deletion process of the USB storage file-sharing function (CWE-22) - CVE-2025-27932

Huiseong Seo reported these vulnerabilities to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 8.8 (High) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
The above CVSS base scores have been assigned for CVE-2025-27718

CVSS V3 Severity:
Base Metrics:8.1 (High) [Other]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: High
  • Availability Impact: High
The above CVSS base scores have been assigned for CVE-2025-27932

CVSS V3 Severity:
Base Metrics:6.5 (Medium) [Other]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: None
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2025-27716

CVSS V3 Severity:
Base Metrics:5.4 (Medium) [Other]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2025-27567

CVSS V3 Severity:
Base Metrics:3.6 (Low) [Other]
  • Attack Vector: Physical
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2025-27574

CVSS V3 Severity:
Base Metrics:2.1 (Low) [Other]
  • Attack Vector: Physical
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2025-27726
Affected Products


KDDI
  • HGW-BL1500HM Ver 002.002.003 and earlier

Impact

  • An arbitrary script may be executed on the web browser of the user who is using the configuration page or functions accessible only from the LAN side of the product (CVE-2025-27567, CVE-2025-27574)
  • The product's files may be obtained and/or altered or arbitrary code may be executed by unauthorized access to specific functions of the product from a device connected to the LAN side (CVE-2025-27716, CVE-2025-27718, CVE-2025-27726)
  • An attacker may delete a file on the device or cause a denial of service (DoS) condition (CVE-2025-27932)
Solution

[Update the firmware]
Update the firmware to the latest version according to the information provided by the developer.
Vendor Information

KDDI Technology
CWE (What is CWE?)

  1. Path Traversal(CWE-22) [IPA Evaluation]
  2. Cross-site Scripting(CWE-79) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2025-27567
  2. CVE-2025-27574
  3. CVE-2025-27716
  4. CVE-2025-27718
  5. CVE-2025-27726
  6. CVE-2025-27932
References

  1. JVN : JVN#04278547
Revision History

  • [2025/03/19]
      Web page was published

Date Public2025/03/19
Date First Published2025/03/19
Date Last Updated2025/03/19