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CVE-2025-21295

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

HIGH
8.1
CVSS Score
Published: January 14, 2025 at 06:03 PM UTC
Updated: June 17, 2026 at 08:43 AM UTC
16 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

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Severity
HIGH8.1
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1507· Microsoft
95%
v < 10.0.10240.2089010.0.10240.0 ≤ v < 10.0.10240.2089010.0.10240.0
Affected range stops below 10.0.10240.20890, so it looks safe — our inference, not a vendor statement
Windows 10 1607· Microsoft
95%
v < 10.0.14393.769910.0.14393.0 ≤ v < 10.0.14393.769910.0.14393.0
Affected range stops below 10.0.14393.7699, so it looks safe — our inference, not a vendor statement
Windows 10 1809· Microsoft
95%
v < 10.0.17763.677510.0.17763.0 ≤ v < 10.0.17763.677510.0.17763.0
Affected range stops below 10.0.17763.6775, so it looks safe — our inference, not a vendor statement
Windows 10 21H2· Microsoft
95%
v < 10.0.19044.537110.0.19044.0 ≤ v < 10.0.19044.537110.0.19044.0
Affected range stops below 10.0.19044.5371, so it looks safe — our inference, not a vendor statement
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.537110.0.19045.0 ≤ v < 10.0.19045.537110.0.19045.0
Affected range stops below 10.0.19045.5371, so it looks safe — our inference, not a vendor statement
Windows 11 22H2· Microsoft
95%
v < 10.0.22621.475110.0.22621.0 ≤ v < 10.0.22621.475110.0.22621.0
Affected range stops below 10.0.22621.4751, so it looks safe — our inference, not a vendor statement
Windows 11 23H2· Microsoft
95%
v < 10.0.22631.475110.0.22631.0 ≤ v < 10.0.22631.475110.0.22631.0
Affected range stops below 10.0.22631.4751, so it looks safe — our inference, not a vendor statement
Windows 11 24H2· Microsoft
95%
v < 10.0.26100.289410.0.26100.0 ≤ v < 10.0.26100.289410.0.26100.0
Affected range stops below 10.0.26100.2894, so it looks safe — our inference, not a vendor statement
Windows Server 2008· Microsoft
95%
6.1.7601.0 ≤ v < 6.1.7601.275206.1.7601.0r2 sp1
Affected range stops below 6.1.7601.27520, so it looks safe — our inference, not a vendor statement
Windows Server 2012· Microsoft
95%
6.2.9200.0 ≤ v < 6.2.9200.252736.3.9600.0 ≤ v < 6.3.9600.223716.2.9200.06.3.9600.0r2
Affected range stops below 6.2.9200.25273, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.22371, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21295

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416NVD-CWE-noinfo

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