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How the CVE Works
CVE-2025-48802 exploits improper certificate validation in Windows Server Message Block (SMB) protocol. An attacker with network access can spoof a trusted entity by presenting a maliciously crafted certificate during SMB session negotiation. The system fails to properly verify the certificate chain, allowing man-in-the-middle (MITM) attacks, credential theft, or data interception. This vulnerability primarily affects SMBv3 when used with specific encryption configurations.
DailyCVE Form
Platform: Windows SMB
Version: v3.1.1
Vulnerability: Spoofing
Severity: Critical
Date: 07/15/2025
Prediction: Patch by 08/2025
What Undercode Say
Analytics
nmap --script smb-security-mode -p 445 <target> wireshark filter: smb2.signature_required == FALSE
How Exploit
- Craft fake SMB server with invalid cert
- Intercept SMB session initiation
- Bypass auth via spoofed handshake
Protection from this CVE
- Disable SMBv3 compression
- Enforce SMB signing via GPO
- Apply MS25-44802 patch
Impact
- Unauthorized data access
- Network privilege escalation
- MITM attacks
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
