Unauthenticated code execution via unsigned logic download
Published Jun 21, 2022 · Updated Jun 2, 2026
Insufficient logic verification in all versions of Phoenix Contact ProConOS, ProConOS eCLR, and MULTIPROG allows remote attackers to execute code. The controller runtime accepts downloaded PLC logic without cryptographic integrity or authenticity checks and executes attacker-supplied instructions. Network or physical access to controller communications is required, and successful exploitation grants full control of the device.
Summary
What happened
Insufficient logic verification in all versions of Phoenix Contact ProConOS, ProConOS eCLR, and MULTIPROG allows remote attackers to execute code. The controller runtime accepts downloaded PLC logic without cryptographic integrity or authenticity checks and executes attacker-supplied instructions. Network or physical access to controller communications is required, and successful exploitation grants full control of the device.
The record
- CVE
- CVE-2022-31801
- Published
- Jun 21, 2022
- Updated
- Jun 2, 2026
- Vendor
- Phoenix Contact
- Product
- ProConOS
- Classifications
- CWE-345, T0843
- 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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Is a vulnerable build present?
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- Affected versionversion=All Versions
What conditions does exploitation require?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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