CVE-2025-47981

SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.

Affected

Microsoft · Windows 10 Version 1507 · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 22H2

CVSS v3.1 MICROSOFT

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

41.12% chance of exploitation in the next 30 days, 99th percentile

Published

2025-07-08

Updated

2026-02-13

Proof-of-concept exploits (3)

• https://www.vicarius.io/vsociety/posts/cve-2025-47981-detection-script-heap-based-buffer-…
• https://www.vicarius.io/vsociety/posts/cve-2025-47981-mitigation-script-heap-based-buffer…
• HKenzoKimura/CVE-2025-479810★ · 2026-09-08

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47981

References

• CVE Record
• NVD entry

Related

• CVE-2021-1675
• CVE-2025-31324