Unauthenticated code execution via scheduler deserialization
Published Sep 9, 2025 · Updated Feb 20, 2026
Deserialization of untrusted data in Microsoft HPC Pack 2019 before 6.3.8352 allows remote attackers to execute code over a network. The HPC Scheduler service on cluster head nodes deserializes attacker-controlled network data; Microsoft has not disclosed the handler or serialized format. No authentication or user interaction is required, and successful exploitation executes code on the head node with confidentiality, integrity, and availability impact.
Summary
What happened
Deserialization of untrusted data in Microsoft HPC Pack 2019 before 6.3.8352 allows remote attackers to execute code over a network. The HPC Scheduler service on cluster head nodes deserializes attacker-controlled network data; Microsoft has not disclosed the handler or serialized format. No authentication or user interaction is required, and successful exploitation executes code on the head node with confidentiality, integrity, and availability impact.
The record
- CVE
- CVE-2025-55232
- Published
- Sep 9, 2025
- Updated
- Feb 20, 2026
- Vendor
- Microsoft
- Product
- Microsoft HPC Pack 2019
- Classifications
- CWE-502, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2025CVE publishedPublication date reported by the CVE source.
- Feb 20, 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=1.0.0 <6.3.8352 Quick Fix QFE
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
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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