CVE-2025-47981
CRITICALCVSS 9.8/10EPSS 21.88%
Last modified
CVE-2025-47981 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.. EPSS estimates a 21.88% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Windows 10 1507 | < 10.0.10240.21073 | — |
| Microsoft | Windows 10 1607 | < 10.0.14393.8246 | — |
| Microsoft | Windows 10 1809 | < 10.0.17763.7558 | — |
| Microsoft | Windows 10 21h2 | < 10.0.19044.6093 | — |
| Microsoft | Windows 10 22h2 | < 10.0.19045.6093 | — |
| Microsoft | Windows 11 22h2 | < 10.0.22621.5624 | — |
| Microsoft | Windows 11 23h2 | < 10.0.22631.5624 | — |
| Microsoft | Windows 11 24h2 | < 10.0.26100.4652 | — |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | < 10.0.14393.8246 | — |
| Microsoft | Windows Server 2019 | < 10.0.17763.7558 | — |
| Microsoft | Windows Server 2022 | < 10.0.20348.3932 | — |
| Microsoft | Windows Server 2022 23h2 | < 10.0.25398.1732 | — |
| Microsoft | Windows Server 2025 | < 10.0.26100.4652 | — |
References
- https://www.vicarius.io/vsociety/posts/cve-2025-47981-mitigation-script-heap-based-buffer-overflow-in-windows-spnego-extended-negotiationExploit, Mitigation, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-47981?
Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.
How severe is CVE-2025-47981?
CVE-2025-47981 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 21.88% probability of exploitation in the next 30 days.
How do I fix CVE-2025-47981?
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.
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Are you affected by CVE-2025-47981?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST