CVE-2021-35532

Malicious firmware installation via deficient upload validation

Published Jun 7, 2022 · Updated Sep 16, 2024

Firmware upload verification bypass in Hitachi Energy TXpert Hub CoreTec 4 allows local users to install malicious firmware. The file-upload validation accepts a firmware image without sufficiently verifying its integrity and authenticity. Exploitation requires local system access and an account permitted to update firmware, after which attacker-supplied firmware can replace trusted device code.

CVSS severity6.0
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware upload verification bypass in Hitachi Energy TXpert Hub CoreTec 4 allows local users to install malicious firmware. The file-upload validation accepts a firmware image without sufficiently verifying its integrity and authenticity. Exploitation requires local system access and an account permitted to update firmware, after which attacker-supplied firmware can replace trusted device code.

The record

CVE
CVE-2021-35532
Published
Jun 7, 2022
Updated
Sep 16, 2024
Vendor
Hitachi Energy
Product
TXpert Hub CoreTec 4
Classifications
CWE-434, CWE-494, T1601
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 7, 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

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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=2.0.0
  2. Affected versionversion=2.0.1
  3. Affected versionversion=2.1.0
  4. Affected versionversion=2.1.1
  5. Affected versionversion=2.1.2
  6. Affected versionversion=2.1.3
  7. Affected versionversion=2.2.0
  8. Affected versionversion=2.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Hitachi Energy · TXpert Hub CoreTec 4version=2.0.0; version=2.0.1; version=2.1.0; version=2.1.1; version=2.1.2; version=2.1.3; version=2.2.0; version=2.2.1

Published CVSS scores

6.0Hitachi EnergyCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:L
7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/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.

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

No observations available

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

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-494Download of Code Without Integrity Check
T1601Modify System Image

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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