CVE-2021-40337Network attack vector

Authenticated script execution via undisclosed web input

Published Jan 25, 2022 · Updated Sep 16, 2024

Cross-site scripting in Hitachi Energy LinkOne 3.20 and 3.22 through 3.26 allows remote authenticated users to read sensitive information. Vendor material locates corrective hardening in the default web.config but does not disclose which input reaches an unsafe HTML or JavaScript output context. Exploitation requires low-privilege authentication and yields browser-context confidentiality and integrity impact without service interruption.

CVSS severity4.2
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Hitachi Energy LinkOne 3.20 and 3.22 through 3.26 allows remote authenticated users to read sensitive information. Vendor material locates corrective hardening in the default web.config but does not disclose which input reaches an unsafe HTML or JavaScript output context. Exploitation requires low-privilege authentication and yields browser-context confidentiality and integrity impact without service interruption.

The record

CVE
CVE-2021-40337
Published
Jan 25, 2022
Updated
Sep 16, 2024
Vendor
Hitachi Energy
Product
LinkOne
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.20
  2. Affected versionversion=3.22
  3. Affected versionversion=3.23
  4. Affected versionversion=3.24
  5. Affected versionversion=3.25
  6. Affected versionversion=3.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Hitachi Energy · LinkOneversion=3.20; version=3.22; version=3.23; version=3.24; version=3.25; version=3.26

Published CVSS scores

4.2Hitachi EnergyCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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