Stack data disclosure via unchecked CPF item count
Published May 12, 2022 · Updated Apr 16, 2025
Out-of-bounds read in OpENer before February 10, 2021 allows remote attackers to read stack data via crafted EtherNet/IP packets. The CPF parser processes three items at the end of its 512-byte receive buffer without checking remaining bytes, then copies adjacent stack values into a socket-address response item. No authentication or user interaction is required, and the documented impact is limited to confidentiality.
Summary
What happened
Out-of-bounds read in OpENer before February 10, 2021 allows remote attackers to read stack data via crafted EtherNet/IP packets. The CPF parser processes three items at the end of its 512-byte receive buffer without checking remaining bytes, then copies adjacent stack values into a socket-address response item. No authentication or user interaction is required, and the documented impact is limited to confidentiality.
The record
- CVE
- CVE-2021-27482
- Published
- May 12, 2022
- Updated
- Apr 16, 2025
- Vendor
- EIPStackGroup
- Product
- OpENer
- Classifications
- CWE-125, T0866
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 12, 2022CVE publishedPublication date reported by the CVE source.
- Apr 16, 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.
- Affected versionversion=unspecified <Feb 10, 2021
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.
Public exploit references
- Claroty CPF stack-data leak proof of conceptproof of concept · demonstrated
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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