Service interruption via out-of-bounds packet read
Published Feb 11, 2025 · Updated Feb 13, 2026
Out-of-bounds read in Microsoft Windows Internet Connection Sharing allows attackers to interrupt the service via crafted network packets. Microsoft has not disclosed the affected parsing function or packet field; the published weakness establishes that ICS reads beyond a buffer boundary. Exploitation requires adjacent-network access and reachable ICS packet processing, and the published impact is limited to service interruption.
Summary
What happened
Out-of-bounds read in Microsoft Windows Internet Connection Sharing allows attackers to interrupt the service via crafted network packets. Microsoft has not disclosed the affected parsing function or packet field; the published weakness establishes that ICS reads beyond a buffer boundary. Exploitation requires adjacent-network access and reachable ICS packet processing, and the published impact is limited to service interruption.
The record
- CVE
- CVE-2025-21254
- Published
- Feb 11, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- 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=10.0.17763.0 <10.0.17763.6893
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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