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CVE-2017-16740 is a stack-based buffer overflow vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1400 controllers, affecting Series B and C devices running firmware version 21.002 and earlier. The flaw is exposed through Modbus TCP functionality and can be triggered remotely when the vulnerable service is enabled. Successful exploitation can corrupt stack memory and may allow remote code execution on the controller. Reporting also describes the issue as a Modbus TCP buffer overflow and notes that it has been associated in some references with denial-of-service outcomes, but the specific vulnerability description identifies possible remote code execution.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability disclosed in 2017 affecting Rockwell Automation Allen-Bradley MicroLogix 1400 controllers; exposure was inferred from firmware versions on internet-exposed devices, and exploitation requires Modbus TCP to be enabled.
A remote code execution vulnerability disclosed in 2017 affecting Rockwell Automation Allen-Bradley MicroLogix 1400 devices; the article notes exposed hosts appeared vulnerable based on firmware versions.
A Modbus TCP denial-of-service vulnerability affecting exposed Rockwell PLC-related hosts; mentioned as present on many exposed devices, but not confirmed as the attack vector in this campaign.
A Modbus TCP denial-of-service vulnerability affecting exposed PLC-related hosts; mentioned as present on many targeted hosts, but not confirmed as the attack vector in this campaign.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.