Is CVE-2010-0477 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2010-0477, but active exploitation has not been confirmed.

Can CVE-2010-0477 be exploited remotely?

Yes. CVE-2010-0477 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2010-0477?

CVE-2010-0477 has a CVSS score of 10.0 (CRITICAL).

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CRITICALPOC

CVE-2010-0477

CWE-399Published: April 14, 2010· Updated: Jun 16, 2026

10.0

CVSS v3.1

Official Description

The SMB client in Microsoft Windows Server 2008 R2 and Windows 7 does not properly handle (1) SMBv1 and (2) SMBv2 response packets, which allows remote SMB servers and man-in-the-middle attackers to execute arbitrary code via a crafted packet that causes the client to read the entirety of the response, and then improperly interact with the Winsock Kernel (WSK), aka "SMB Client Message Size Vulnerability."

NVD Source

Technical Analysis

CVE-2010-0477 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2010-0477. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.