Service interruption via out-of-bounds DHCP read
Published Feb 11, 2025 · Updated Feb 13, 2026
Out-of-bounds read in Microsoft Windows DHCP Client Service before build 10.0.26100.3194 allows attackers to interrupt service. Microsoft has not disclosed which DHCP message field is read beyond its buffer or the code path that performs the invalid read. Exploitation requires adjacent network access and user interaction; the reported impact is limited to availability.
Summary
What happened
Out-of-bounds read in Microsoft Windows DHCP Client Service before build 10.0.26100.3194 allows attackers to interrupt service. Microsoft has not disclosed which DHCP message field is read beyond its buffer or the code path that performs the invalid read. Exploitation requires adjacent network access and user interaction; the reported impact is limited to availability.
The record
- CVE
- CVE-2025-21179
- Published
- Feb 11, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-125, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 11, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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=10.0.26100.0 <10.0.26100.3194
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.
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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