Unauthenticated heap over-read via inflated object count
Published Jul 30, 2026 · Updated Jul 30, 2026
Out-of-bounds read in MZ Automation lib60870 2.4.0 allows remote attackers to over-read heap memory via a crafted IEC 60870-5-104 information frame. TestCommand_getFromBuffer omits the information-object address length from its minimum-size check, so an inflated VSQ object count advances parsing one byte past the allocated message. A network connection to a CS104 server on TCP port 2404 is sufficient; no authentication or operator action is required, and the supplied proof of concept produces a sanitizer-detected crash.
Summary
What happened
Out-of-bounds read in MZ Automation lib60870 2.4.0 allows remote attackers to over-read heap memory via a crafted IEC 60870-5-104 information frame. TestCommand_getFromBuffer omits the information-object address length from its minimum-size check, so an inflated VSQ object count advances parsing one byte past the allocated message. A network connection to a CS104 server on TCP port 2404 is sufficient; no authentication or operator action is required, and the supplied proof of concept produces a sanitizer-detected crash.
The record
- CVE
- CVE-2026-61893
- Published
- Jul 30, 2026
- Updated
- Jul 30, 2026
- Vendor
- MZ Automation GmbH
- Product
- lib60870
- Classifications
- CWE-125, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 30, 2026CVE publishedPublication date reported by the CVE source.
- Jul 30, 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=2.4.0
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
- 16-byte IEC 60870-5-104 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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