CVE-2026-113364
Received Received - Intake

Buffer Overflow in NEC WebSAM WinShare

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: NEC Corporation

Description
Buffer Overflow in the data receiving process in NEC Corporation WebSAM WinShare Ver 7.5.0 and earlier, Ver 7.6.0 and Ver 7.7.0 through 7.7.2 on Windows allows a remote unauthenticated attacker to execute arbitrary code with SYSTEM privileges via a crafted packet with a malformed data size value in the protocol header.

CVSS Scores

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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-113364
EUVD
EUVD-2026-119798

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
nec_corporation websam_winshare 7.5.0
nec_corporation websam_winshare From 7.6.0 (inc) to 7.7.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

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Executive Summary

This is a buffer overflow vulnerability in NEC Corporation's WebSAM WinShare software versions 7.5.0 and earlier, 7.6.0, and 7.7.0 through 7.7.2 on Windows. It occurs during the data receiving process when a remote unauthenticated attacker sends a crafted packet with a malformed data size value in the protocol header. This can allow the attacker to execute arbitrary code with SYSTEM privileges on the target system.

Impact Analysis

An attacker could exploit this vulnerability to gain full control of a system running the vulnerable WebSAM WinShare software. This could lead to unauthorized access, data theft, installation of malware, or disruption of services. The high CVSS score indicates a critical risk requiring immediate attention.

Mitigation Strategies

Apply the corrective module provided by NEC Corporation for WebSAM WinShare Ver 7.5.0 and earlier, Ver 7.6.0, and Ver 7.7.0 through 7.7.2. Check the official NEC security advisory for the update at the provided support link.

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