CVE-2021-40339Network attack vector

Sensitive information disclosure via missing HTTP headers

Published Jan 28, 2022 · Updated Sep 17, 2024

Configuration weakness in Hitachi Energy LinkOne WebView 3.20 and 3.22 through 3.26 allows remote attackers to retrieve sensitive information. The web server configuration omits security-related HTTP response headers, but Hitachi Energy has not identified the omitted headers or disclosed the request sequence that exposes the data. The issue is remotely reachable without authentication or user interaction, with no reported ability to alter data or interrupt service.

CVSS severity3.7
Low
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Configuration weakness in Hitachi Energy LinkOne WebView 3.20 and 3.22 through 3.26 allows remote attackers to retrieve sensitive information. The web server configuration omits security-related HTTP response headers, but Hitachi Energy has not identified the omitted headers or disclosed the request sequence that exposes the data. The issue is remotely reachable without authentication or user interaction, with no reported ability to alter data or interrupt service.

The record

CVE
CVE-2021-40339
Published
Jan 28, 2022
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-16
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.7Hitachi EnergyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-16Configuration

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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