CVE-2021-40340Network attack vector

Server information disclosure via ASP misconfiguration

Published Jan 28, 2022 · Updated Sep 17, 2024

Information exposure in Hitachi Energy LinkOne 3.20 and 3.22 through 3.26 allows remote attackers to read server and ASP.NET details. The ASP server is misconfigured to expose implementation information instead of suppressing it in responses. Exploitation requires no authentication but has unspecified request conditions, and the disclosed details provide reconnaissance rather than direct data modification or service interruption.

CVSS severity7.5
High
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

Information exposure in Hitachi Energy LinkOne 3.20 and 3.22 through 3.26 allows remote attackers to read server and ASP.NET details. The ASP server is misconfigured to expose implementation information instead of suppressing it in responses. Exploitation requires no authentication but has unspecified request conditions, and the disclosed details provide reconnaissance rather than direct data modification or service interruption.

The record

CVE
CVE-2021-40340
Published
Jan 28, 2022
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1592.002
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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.7Hitachi EnergyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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-200Exposure of Sensitive Information to an Unauthorized Actor
T1592.002Gather Victim Host Information: Software

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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