CVE tracker / CVE-2025-48802
CVE-2025-48802
CVE-2025-48802 is the Windows SMB Server Spoofing Vulnerability. Microsoft rates it Important, CVSS 6.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published July 8, 2025.
Risk summary
MediumSpoofing
6.5
CVSS v3 base
0.9%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Improper certificate validation in Windows SMB allows an authorized attacker to perform spoofing over a network.”
How to fix it
Microsoft lists 7 affected products and the update that fixes each:
- KB5062552 · fixed build 10.0.22621.5624, 10.0.22631.5624
Windows 11 Version 22H2 for x64-based Systems, Windows 11 Version 22H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems - KB5062570 · fixed build 10.0.25398.1732
Windows Server 2022, 23H2 Edition (Server Core installation) - KB5062572 · fixed build 10.0.20348.3932
Windows Server 2022 (Server Core installation), Windows Server 2022
What Microsoft changed
- July 8, 2025: Information published.
Details
- Weakness
- CWE-295: Improper Certificate Validation
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- July 8, 2025
- Last revised
- July 8, 2025
Get told when this changes
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References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.