Vulnerability · Published Jul 8, 2025 · Assigned by microsoft
CVE-2025-47981SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity heap buffer overflow in Windows 10 Version 1507 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 41.1% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)41.1%top 1.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability vendor-advisory, patch
- https://www.vicarius.io/vsociety/posts/cve-2025-47981-detection-script-heap-based-buffer-overflow-in-windows-spnego-extended-negotiation
- https://www.vicarius.io/vsociety/posts/cve-2025-47981-mitigation-script-heap-based-buffer-overflow-in-windows-spnego-extended-negotiation