Vulnerability Snapshot
CVE-2016-9343 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.
Affected technology: softlogix_5800_controller_firmware, softlogix_5800_controller, rslogix_emulate_5000_firmware, rslogix_emulate_5000, guardlogix_5570_controller_firmware, plus 5 other product variants.
Executive Summary
An issue was discovered in Rockwell Automation Logix5000 Programmable Automation Controller FRN 16.00 through 21.00 (excluding all firmware versions prior to FRN 16.00, which are not affected). By sending malformed common industrial protocol (CIP) packet, an attacker may be able to overflow a stack-based buffer and execute code on the controller or initiate a nonrecoverable fault resulting in a denial of service.
Why It Matters
CVE-2016-9343 is rated CRITICAL severity, requiring immediate attention from security teams.
CVSS Base Score: 10/10
Affected Technologies
Vendors: rockwellautomation
Products: softlogix_5800_controller_firmware, softlogix_5800_controller, rslogix_emulate_5000_firmware, rslogix_emulate_5000, guardlogix_5570_controller_firmware, guardlogix_5570_controller, flexlogix_l34_controller_firmware, flexlogix_l34_controller, controllogix_l55_controller_firmware, controllogix_l55_controller, controllogix_5570_redundant_controller_firmware, controllogix_5570_redundant_controller, controllogix_5570_controller_firmware, controllogix_5570_controller, controllogix_5560_redundant_controller_firmware, controllogix_5560_redundant_controller, controllogix_5560_controller_firmware, controllogix_5560_controller, 1769_compactlogix_l3x_controller_firmware, 1769_compactlogix_l3x_controller, 1769_compactlogix_l23x_controller_firmware, 1769_compactlogix_l23x_controller, 1769_compactlogix_5370_l3_controller_firmware, 1769_compactlogix_5370_l3_controller, 1769_compactlogix_5370_l2_controller_firmware, 1769_compactlogix_5370_l2_controller, 1769_compactlogix_5370_l1_controller_firmware, 1769_compactlogix_5370_l1_controller, 1768_compactlogix_l4x_controller_firmware, 1768_compactlogix_l4x_controller, 1768_compact_guardlogix_l4xs_controller_firmware, 1768_compact_guardlogix_l4xs_controller
🛡️What Defenders Should Check
Use Vulnios to continuously monitor your exposure to CVE-2016-9343 and similar vulnerabilities.
References & Sources
How Vulnios Detects This
Vulnios scans for this vulnerability using Trivy and Grype for SBOM-based CVE matching and Vulnios CVE feed continuous monitoring against your asset inventory. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.
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Affected Products
Sources
Related Threat Alerts
- Critical Vulnerability: CVE-2017-7899 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
- Critical Vulnerability: CVE-2017-7902 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
- Critical Vulnerability: CVE-2017-7903 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
- Critical Vulnerability: CVE-2017-7898 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
Frequently Asked Questions
What is CVE-2016-9343?
CVE-2016-9343 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. An issue was discovered in Rockwell Automation Logix5000 Programmable Automation Controller FRN 16.00 through 21.00 (excluding all firmware versions prior to FRN 16.00, which are not affected). By sen
Am I affected?
Check whether your environment runs softlogix_5800_controller_firmware, softlogix_5800_controller, rslogix_emulate_5000_firmware, rslogix_emulate_5000, guardlogix_5570_controller_firmware. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.
How urgent is the response?
Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.
How do I remediate?
Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.
Where can I track exploitation activity?
Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2016-9343. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.
How does Vulnios help with this?
Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.
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