Unauthenticated device takeover via unsigned logic upload
Published Jun 21, 2022 · Updated Jun 2, 2026
Insufficient logic-authenticity verification in Phoenix Contact classic line controllers allows remote attackers to upload malicious logic. The ProConOS/ProConOS eCLR runtime accepts downloaded control logic without checking its integrity or authenticity before use. No authentication or user interaction is required; network access to the controller is sufficient to replace its logic and gain full device control.
Summary
What happened
Insufficient logic-authenticity verification in Phoenix Contact classic line controllers allows remote attackers to upload malicious logic. The ProConOS/ProConOS eCLR runtime accepts downloaded control logic without checking its integrity or authenticity before use. No authentication or user interaction is required; network access to the controller is sufficient to replace its logic and gain full device control.
The record
- CVE
- CVE-2022-31800
- Published
- Jun 21, 2022
- Updated
- Jun 2, 2026
- Vendor
- Phoenix Contact
- Product
- ILC 1x1
- Classifications
- CWE-345, T0821
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 21, 2022CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=All Versions
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What is affected?
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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