← Vulnerability feed

Vulnerability record · CVE-2020-27251 · published 26 November 2020

CVE-2020-27251: Rockwellautomation factorytalk linx heap-based buffer overflow vulnerability

Rockwellautomation · Factorytalk Linx

A heap overflow vulnerability exists within FactoryTalk Linx Version 6.11 and prior. This vulnerability could allow a remote, unauthenticated attacker to send malicious port ranges, which could result in remote code execution.

9.8 CVSS 3.1 Critical EPSS 6.8% · top 6.2% CWE-122 · Heap-based buffer overflow
9.8CVSS 3.1 base score, v2 7.5
6.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A heap overflow vulnerability exists within FactoryTalk Linx Version 6.11 and prior. This vulnerability could allow a remote, unauthenticated attacker to send malicious port ranges, which could result in remote code execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://us-cert.cisa.gov/ics/advisories/icsa-20-329-01 Third Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-329-01 Third Party AdvisoryUS Government Resource

Track CVE-2020-27251 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-12001Rockwellautomation factorytalk linx improper input validation vulnerabilityFactoryTalk Linx versions 6.00, 6.10, and 6.11, RSLinx Classic v4.11.00 and prior,Connected Components Workbench: Version 12 and prior, ControlFLASH:…EPSS 12%9.1CVE-2023-29464Rockwellautomation factorytalk linx improper input validation vulnerabilityFactoryTalk Linx, in the Rockwell Automation PanelView Plus, allows an unauthenticated threat actor to read data from memory via crafted malicious pa…EPSS 9.6%8.5CVE-2025-9068Rockwellautomation factorytalk linx improper privilege management vulnerabilityA security issue exists within the Rockwell Automation Driver Package x64 Microsoft Installer File (MSI) repair functionality, installed with FTLinx.…EPSS 0.18%8.5CVE-2025-9067Rockwellautomation factorytalk linx improper privilege management vulnerabilityA security issue exists within the x86 Microsoft Installer File (MSI), installed with FTLinx. Authenticated attackers with valid Windows user credent…EPSS 0.18%8.4CVE-2025-7972Rockwellautomation factorytalk linx vulnerabilityA security issue exists within the FactoryTalk Linx Network Browser. By modifying the process.env.NODE_ENV to ‘development’, the attacker can disable…EPSS 0.50%8.1CVE-2020-11999Rockwellautomation factorytalk linx improper input validation vulnerabilityFactoryTalk Linx versions 6.00, 6.10, and 6.11, RSLinx Classic v4.11.00 and prior,Connected Components Workbench: Version 12 and prior, ControlFLASH:…EPSS 2.8%7.5CVE-2020-5801Rockwellautomation factorytalk linx vulnerabilityAn attacker can craft and send an OpenNamespace message to port 4241 with valid session-id that triggers an unhandled exception in CFTLDManager::Hand…EPSS 25%7.5CVE-2020-5802Rockwellautomation factorytalk linx allocation without limits vulnerabilityAn attacker-controlled memory allocation size can be passed to the C++ new operator in RnaDaSvr.dll by sending a specially crafted ConfigureItems mes…EPSS 39%

Source: NIST National Vulnerability Database (record CVE-2020-27251), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.