Service interruption via malformed port 102 packets
Published Dec 13, 2022 · Updated Apr 21, 2025
Improper input validation in Siemens SIMATIC controllers allows remote authenticated users to interrupt service through crafted port 102/TCP packets. The port 102/TCP service fails to validate specified input types correctly and processes specially crafted packets into a denial-of-service condition. High-privilege access to the network-reachable service is required, and successful exploitation interrupts controller availability.
Summary
What happened
Improper input validation in Siemens SIMATIC controllers allows remote authenticated users to interrupt service through crafted port 102/TCP packets. The port 102/TCP service fails to validate specified input types correctly and processes specially crafted packets into a denial-of-service condition. High-privilege access to the network-reachable service is required, and successful exploitation interrupts controller availability.
The record
- CVE
- CVE-2021-44694
- Published
- Dec 13, 2022
- Updated
- Apr 21, 2025
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 CPU 1518T-4 PN/DP
- Classifications
- CWE-1287, CWE-20, T1499.004
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Dec 13, 2022CVE publishedPublication date reported by the CVE source.
- Apr 21, 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?
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- Affected versionversion=All versions < V3.0.1
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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