CVE-2025-5517Network attack vector

Service interruption via oversized OCPP field

Published Oct 20, 2025 · Updated Oct 20, 2025

Heap-based buffer overflow in ABB Terra AC wallbox firmware allows remote authenticated users to interrupt service through a crafted OCPP message. The firmware fails to limit the length of an OCPP field in a specific processing case, allowing the field to corrupt heap memory. Exploitation requires control of the CSMS or interception of unencrypted charger-to-CSMS traffic, and the resulting corruption affects charger integrity and availability.

CVSS severity6.9
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Heap-based buffer overflow in ABB Terra AC wallbox firmware allows remote authenticated users to interrupt service through a crafted OCPP message. The firmware fails to limit the length of an OCPP field in a specific processing case, allowing the field to corrupt heap memory. Exploitation requires control of the CSMS or interception of unencrypted charger-to-CSMS traffic, and the resulting corruption affects charger integrity and availability.

The record

CVE
CVE-2025-5517
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
Terra AC wallbox
Classifications
CWE-122, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 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 <=1.8.2
  2. Affected versionversion=0 <=1.8.21
  3. Affected versionversion=0 <=1.8.32

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · Terra AC wallboxversion=0 <=1.8.2; version=0 <=1.8.21; version=0 <=1.8.32

Published CVSS scores

6.9ABBCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
6.8ABBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
6.1ABBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H/E:P/RL:O/RC:C

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

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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