Arbitrary protected-memory access via undisclosed operation
Published May 28, 2021 · Updated Jun 2, 2026
Memory protection bypass in Siemens industrial controllers allows remote attackers to read or write protected memory through port 102/tcp. Siemens identifies a specific operation as bypassing memory protections but has not disclosed the operation or the validation error that permits it. Unauthenticated network access to the S7 communication service is required; exploitation can expose sensitive data or place attacker-supplied data and code in protected memory.
Summary
What happened
Memory protection bypass in Siemens industrial controllers allows remote attackers to read or write protected memory through port 102/tcp. Siemens identifies a specific operation as bypassing memory protections but has not disclosed the operation or the validation error that permits it. Unauthenticated network access to the S7 communication service is required; exploitation can expose sensitive data or place attacker-supplied data and code in protected memory.
The record
- CVE
- CVE-2020-15782
- Published
- May 28, 2021
- Updated
- Jun 2, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 CPU
- Classifications
- CWE-119, T0819
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 28, 2021CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All versions < V2.9.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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