# Outdated MongoDB in ABB's Industrial Automation Platform Exposes Critical Infrastructure to Unauthenticated Attacks
## The Threat
ABB Ability Zenon — a widely deployed industrial automation and SCADA platform used in energy grids, water treatment facilities, chemical plants, and hospitals — ships with a bundled MongoDB 4.2 instance as part of its IIoT services component. That database is end-of-life, unpatched, and carrying vulnerabilities that allow unauthenticated remote attackers to read arbitrary heap memory and authorized users to trigger out-of-bounds reads that expose the contents of system memory.
The core problem isn't a novel attack technique. MongoDB 4.2 reached end-of-life in April 2024, and the vulnerabilities now surfacing in ABB's advisory span nearly six years of accumulated debt — including CVE-2020-7928, a flaw disclosed in 2020. ABB bundled the database, never updated it, and left operators with no automatic patch path. The only fix is manual: either swap in a supported MongoDB version yourself or uninstall IIoT Services entirely.
What makes this dangerous in an OT context is the combination of network-accessible exposure, unauthenticated triggering conditions, and the sensitivity of the environments these systems control. An attacker who can reach the MongoDB port on a Zenon IIoT server — common in poorly segmented industrial networks — can trigger a heap memory disclosure without any credentials. That information can then be used to fingerprint the host, leak configuration data, or inform follow-on exploitation. In operational technology environments where availability is paramount and patch windows are measured in months, that's a meaningful threat surface.
## Severity and Impact
| CVE | CVSS v3.1 | CVSS v4.0 | Severity | Vector | CWE |
|-----|-----------|-----------|----------|--------|-----|
| CVE-2025-14847 | 7.5 | 8.7 | HIGH | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CWE-130 (Improper Handling of Length Parameter Inconsistency) |
| CVE-2020-7928 | — | — | HIGH | Network-accessible, authenticated user required | Out-of-bounds read / arbitrary memory access |
Additional vulnerability classes identified across the bundled MongoDB component include: null byte injection, unsafe value collapse, undefined API input behavior, regex flaws, uncaught exceptions, reachable assertions, resource exhaustion, out-of-bounds write, log output neutralization failures, improper certificate validation, and execution with unnecessary privileges. The overall vendor CVSS score across the advisory is 7.8 HIGH.
## Affected Products
ABB Ability Zenon — all versions with IIoT services utilizing MongoDB 4.2 installed:
For CVE-2025-14847 specifically, patched versions exist in currently supported MongoDB branches:
Deployed globally across: Chemical, Communications, Critical Manufacturing, Dams, Energy, Healthcare and Public Health, Information Technology, and Water and Wastewater sectors.
## Mitigations
ABB has not released an updated Zenon package with a patched MongoDB. The remediation burden falls entirely on operators, with two paths:
Option 1 — Replace the bundled MongoDB instance (if IIoT services are required):
Option 2 — Uninstall IIoT Services (if IIoT functionality is not needed):
Network-level controls (apply regardless of remediation path):
## References
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## HackWire Analysis
The deeper story here isn't really about MongoDB heap reads — it's about a structural failure in how ICS vendors handle third-party software dependencies. ABB bundled MongoDB 4.2 into Ability Zenon and then, as MongoDB's own end-of-life clock ran down and vulnerability disclosures piled up, apparently did nothing. CVE-2020-7928 was disclosed in 2020. It's now 2026. That's six years of a known, network-accessible memory disclosure vulnerability sitting inside industrial control systems at energy utilities and water treatment plants.
This is the bundled-dependency trap in its worst form: the ICS vendor controls the packaging, the database vendor drops support, and the operator — who often can't patch anything without a change control process, a maintenance window, and sign-off from an OEM — is left holding a live vulnerability they didn't know they had. ABB's own fix guidance underscores the problem: there's no update package, no automated remediation. You either do a manual database swap by reading the help documentation, or you uninstall the feature entirely.
For defenders, the priority filter here is simple: if you run ABB Ability Zenon with IIoT services enabled, check your MongoDB version today. If it's 4.2 (or anything in the 3.x/4.0.x/4.1.x range), treat that port as a live exposure and firewall it immediately while you work through the replacement process. Don't assume your OT network is too flat for attackers to reach it — lateral movement from IT to OT is a documented attacker technique, and a heap memory disclosure on a SCADA server is exactly the kind of reconnaissance step that precedes something worse.
Broader lesson: every ICS procurement process should now include a software bill of materials requirement. If your automation vendor can't tell you what database engine version is running inside their platform, that's an unacceptable answer.
— HackWire Editorial
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