CVE-2025-53520Network attack vector

Tampered firmware installation via unchecked TTComp archives

Published Aug 8, 2025 · Updated Aug 8, 2025

Firmware integrity failure in all versions of EG4 inverters allows attackers to install altered firmware through supported update channels. The update mechanism accepts unencrypted TTComp archives without verifying integrity, so unpacked and modified contents remain undetected. Exploitation requires an update to be initiated through the cloud-connected Monitoring Center, a USB dongle, or a serial connection and can replace trusted device code.

CVSS severity8.6
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware integrity failure in all versions of EG4 inverters allows attackers to install altered firmware through supported update channels. The update mechanism accepts unencrypted TTComp archives without verifying integrity, so unpacked and modified contents remain undetected. Exploitation requires an update to be initiated through the cloud-connected Monitoring Center, a USB dongle, or a serial connection and can replace trusted device code.

The record

CVE
CVE-2025-53520
Published
Aug 8, 2025
Updated
Aug 8, 2025
Vendor
EG4 Electronics
Product
EG4 18kPV
Classifications
CWE-494, T0857
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=all versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EG4 Electronics · EG4 18kPVversion=all versions
EG4 Electronics · EG4 FlexBOSS18version=all versions
EG4 Electronics · EG4 12kPVversion=all versions
EG4 Electronics · EG4 6000XPversion=all versions
EG4 Electronics · EG4 GridBOSSversion=all versions
EG4 Electronics · EG4 FlexBOSS21version=all versions
EG4 Electronics · EG4 12000XPversion=all versions

Published CVSS scores

8.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.6ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T0857System Firmware

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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