CVE-2025-12143

Firmware compromise via malformed OCPP RandomDelay value

Published Nov 28, 2025 · Updated Nov 28, 2025

Stack-based buffer overflow in ABB Terra AC wallbox (JP) 1.8.33 and earlier allows attackers to alter firmware behavior. The firmware fails to bound an unexpected numeric value in the customized OCPP “RandomDelay” backend key, corrupting stack memory. Exploitation requires high-privilege adjacent access and control of the encrypted Bluetooth message path; success can write flash memory and interrupt charger availability.

CVSS severity6.9
Medium
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

Stack-based buffer overflow in ABB Terra AC wallbox (JP) 1.8.33 and earlier allows attackers to alter firmware behavior. The firmware fails to bound an unexpected numeric value in the customized OCPP “RandomDelay” backend key, corrupting stack memory. Exploitation requires high-privilege adjacent access and control of the encrypted Bluetooth message path; success can write flash memory and interrupt charger availability.

The record

CVE
CVE-2025-12143
Published
Nov 28, 2025
Updated
Nov 28, 2025
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
Terra AC wallbox
Classifications
CWE-121, T1693.001
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Nov 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 28, 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=0 <=1.8.33

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · Terra AC wallboxversion=0 <=1.8.33

Published CVSS scores

5.5ABB PSIRTCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H/E:P/RL:O/RC:C
6.1ABB PSIRTCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
6.7ABB PSIRTAV:A/AC:L/Au:M/C:N/I:C/A:C
6.9ABB PSIRTCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA: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.

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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)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1693.001Modify Firmware: System 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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