---
id: "CVE-2026-113364"
page: "https://infrastack.ai/live/CVE-2026-113364"
kind: "vulnerability"
aliases: ["CVE-2026-113364"]
title: "NEC WebSAM WinShare: unauthenticated packet overflow runs code as SYSTEM"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"name": "WebSAM WinShare", "fixed": [], "affected": "<= 7.5.0, 7.6.0, >= 7.7.0, <= 7.7.2", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["nec-websam", "vendor", "windows", "winshare"]
not_affected_if: ["not-installed", "unsupported-version-not-listed"]
published_at: "2026-11-09T05:18:26+00:00"
first_seen_at: "2026-11-09T05:25:20+00:00"
updated_at: "2026-11-09T05:27:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113364", "first_seen_at": "2026-11-09T05:25:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-09T05:27:59+00:00"}]
exploit_sources: []
---

# NEC WebSAM WinShare: unauthenticated packet overflow runs code as SYSTEM

Link for people: https://infrastack.ai/live/CVE-2026-113364 (this .md is for agents)

NEC WebSAM WinShare on Windows has a buffer overflow in its data receiving process, triggered by a crafted packet with a malformed data size in the protocol header. A remote attacker with no login can run arbitrary code with SYSTEM privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:WebSAM WinShare affected <= 7.5.0, 7.6.0, >= 7.7.0, <= 7.7.2 fixed no fixed version listed

## How to check

- Check whether WebSAM WinShare is installed on Windows hosts and note its version.
- Confirm whether the affected versions `7.5.0` and earlier, `7.6.0`, or `7.7.0` through `7.7.2` are in use.
- Check whether the WinShare data receiving port is reachable from untrusted networks.

## Timeline

- 2026-11-09T05:25:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113364
- 2026-11-09T05:27:59+00:00 analyst — Could not reach NEC advisory/JVN (web-cli out of Exa credits, NEC PSIRT 403, NVD page empty). Fixed version, ports and exposure unknown; nothing verified. Affected range is from the NVD description (CNA: NEC PSIRT). Settle by reading NEC security-info page or JVN for this CVE.

## From the sources

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.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_