Network service interruption via out-of-bounds read
Published Sep 8, 2026 · Updated Sep 9, 2026
Out-of-bounds read in Microsoft Windows DHCP Server allows remote attackers to interrupt the service over a network. Microsoft has not disclosed the affected parser, packet field, or bounds-checking error that causes DHCP Server to read beyond its intended buffer. No authentication or user interaction is required; the documented consequence is availability loss, with no reported disclosure or modification of data.
Summary
What happened
Out-of-bounds read in Microsoft Windows DHCP Server allows remote attackers to interrupt the service over a network. Microsoft has not disclosed the affected parser, packet field, or bounds-checking error that causes DHCP Server to read beyond its intended buffer. No authentication or user interaction is required; the documented consequence is availability loss, with no reported disclosure or modification of data.
The record
- CVE
- CVE-2026-77501
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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 <10.0.17763.9245
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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