CVE-2026-45603
HIGHCVSS 7/10EPSS 0.18%
Last modified
CVE-2026-45603 is a high-severity vulnerability rated 7/10 on the CVSS scale. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.9234 |
| Microsoft | Windows 10 1809 | < 10.0.17763.8880 |
| Microsoft | Windows 10 21h2 | < 10.0.19044.7417 |
| Microsoft | Windows 10 22h2 | < 10.0.19045.7417 |
| Microsoft | Windows 11 23h2 | < 10.0.22631.7219 |
| Microsoft | Windows 11 24h2 | < 10.0.26100.8655 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.8655 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2269 |
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.9234 |
| Microsoft | Windows Server 2019 | < 10.0.17763.8880 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5256 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32995 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-45603?
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-45603?
CVE-2026-45603 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-45603?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-45597Concurrent execution using shared resource with improper syn…7
- CVE-2026-45598Concurrent execution using shared resource with improper syn…7
- CVE-2026-45599Use after free in Universal Plug and Play (upnp.dll) allows …8.1
- CVE-2026-45600Access of resource using incompatible type ('type confusion'…7.8
- CVE-2026-45601Concurrent execution using shared resource with improper syn…7
- CVE-2026-45602No cwe for this issue in Windows DHCP Server allows an unaut…9.1
- CVE-2026-45604Out-of-bounds read in Windows Application Identity (AppID) S…5.5
- CVE-2026-45605Use after free in Windows Bluetooth Service allows an author…7.8
- CVE-2026-45606Out-of-bounds read in Microsoft UxTheme Library (uxtheme.dll…5.5
- CVE-2026-45607Out-of-bounds read in Windows Hyper-V allows an unauthorized…7.8
- CVE-2026-45608Out-of-bounds read in Windows DHCP Client allows an unauthor…6.8
- CVE-2026-45609mcp-security provides Security and Authorization support for…6.5
Are you affected by CVE-2026-45603?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST