CVE-2025-27718Network attack vector

Arbitrary code execution via upload path traversal

Published Mar 28, 2025 · Updated Mar 28, 2025

Path traversal in KDDI HGW-BL1500HM 002.002.003 and earlier allows remote authenticated users to alter files through LAN HTTP requests. The USB storage file-upload process accepts crafted path components without confining the destination to its restricted directory. Access requires a device connected to the LAN and low privileges; successful traversal can read or alter gateway files and execute arbitrary code.

CVSS severity8.8
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in KDDI HGW-BL1500HM 002.002.003 and earlier allows remote authenticated users to alter files through LAN HTTP requests. The USB storage file-upload process accepts crafted path components without confining the destination to its restricted directory. Access requires a device connected to the LAN and low privileges; successful traversal can read or alter gateway files and execute arbitrary code.

The record

CVE
CVE-2025-27718
Published
Mar 28, 2025
Updated
Mar 28, 2025
Vendor
KDDI Corporation
Product
HGW-BL1500HM
Classifications
CWE-22
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Ver 002.002.003 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

KDDI Corporation · HGW-BL1500HMversion=Ver 002.002.003 and earlier

Published CVSS scores

8.8JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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