Unauthenticated code execution via undisclosed integer overflow
Published Feb 14, 2023 · Updated Aug 19, 2026
Integer overflow in Microsoft Windows iSCSI Discovery Service allows unauthenticated remote attackers to execute code over the network. Microsoft identifies the weakness as an integer overflow but does not disclose the affected field, arithmetic operation, or malformed iSCSI input that triggers it. Exploitation requires network reachability to the discovery service on an affected 32-bit Windows build and grants code execution in the service context.
Summary
What happened
Integer overflow in Microsoft Windows iSCSI Discovery Service allows unauthenticated remote attackers to execute code over the network. Microsoft identifies the weakness as an integer overflow but does not disclose the affected field, arithmetic operation, or malformed iSCSI input that triggers it. Exploitation requires network reachability to the discovery service on an affected 32-bit Windows build and grants code execution in the service context.
The record
- CVE
- CVE-2023-21803
- Published
- Feb 14, 2023
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-190, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 14, 2023CVE publishedPublication date reported by the CVE source.
- Aug 19, 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=10.0.10240.0 <10.0.10240.19747
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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