CVE-2025-47981: Microsoft Windows 10 Version 1507 · Heap-based Buffer Overflow
Affects Microsoft Windows 10 Version 1507Source CVE Database V5
Not known to be exploited · 41% EPSS · CVSS 9.8 Critical.
Data as of 26 Oct 2026, 12:55 UTC
- EPSS
- 41.1% chance of exploitation in 30 days – higher than 98% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CExploitation evidence
Disclosed: evidence found.
CVE published 8 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1507 | Affected
| Fixed in– |
AI-suggested
- Immediate upgrade or migration away from Windows 10 Version 1507 to a supported and patched Windows version is the most effective mitigation.
- If upgrading is not immediately feasible, implement network-level controls to restrict or block SPNEGO Extended Negotiation traffic, especially from untrusted networks or the internet.
- Employ intrusion detection and prevention systems (IDS/IPS) with signatures or heuristics targeting anomalous SPNEGO negotiation packets.
- Harden network perimeter defenses and segment critical systems to limit exposure to potentially vulnerable hosts.
- Monitor network traffic for unusual authentication negotiation attempts that could indicate exploitation attempts.
- Enforce strict access controls and network segmentation to reduce lateral movement if compromise occurs.
- Maintain up-to-date backups and incident response plans tailored to rapid containment of remote code execution incidents.
- Engage with Microsoft support channels for any forthcoming patches or workarounds and apply them promptly.
- Conduct vulnerability scanning and asset inventory to identify all systems running the affected Windows version.
- Educate IT staff on this vulnerability and ensure rapid patch management processes are in place.
Description
Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over a network.
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47981 (opens in a new tab)
- vicarius.io/vsociety/posts/cve-2025-47981-detection-script-heap-based-buffer-overflow-in-windows-spnego-extended-negotiation (opens in a new tab)
- vicarius.io/vsociety/posts/cve-2025-47981-mitigation-script-heap-based-buffer-overflow-in-windows-spnego-extended-negotiation (opens in a new tab)