CVE-2026-20919
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
A race condition vulnerability in Windows SMB Server allows an authorized attacker to elevate privileges over a network. The issue stems from improper synchronization when accessing shared resources concurrently.
Risk Assessment
An authorized user can escalate privileges, potentially leading to system compromise or access to sensitive data.
Recommendation
Install the latest security updates from Microsoft for Windows SMB Server. Monitor and restrict access to SMB services.
Other vulnerabilities in Windows SMB Server
See all- CVE-2026-96325High
A missing reference to an active allocated resource in Windows SMB Server allows an unauthorized attacker to deny service over a network. The flaw lies in how the SMB service manages resources.
- CVE-2026-88127High
Use after free in Windows SMB Server allows an authorized attacker to elevate privileges locally.
- CVE-2026-26128High
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
- CVE-2019-0703MediumActively exploited
An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests, aka 'Windows SMB Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0704 and CVE-2019-0821.
- CVE-2026-72949High
Null pointer dereference in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to deny service over a network.
- CVE-2026-69403Medium
A missing authorization vulnerability in Windows SMB Server allows an authorized attacker to disclose information locally.
- CVE-2026-69374Medium
The vulnerability in Windows SMB Server is an allocation of resources without limits or throttling. It allows an authorized attacker to deny service over a network.
- CVE-2026-62800High
Heap-based buffer overflow in Windows SMB Server allows an authorized attacker to execute code over a network.
- CVE-2026-62790High
Heap-based buffer overflow in Windows SMB Server allows an authorized attacker to execute code over a network.
- CVE-2026-57089High
Use-after-free vulnerability in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to execute code over a network.
Original NVD description (English source)
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS