Vulnerability Snapshot
CVE-2017-7902 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: 1763-l16awa_series_a, 1763-l16awa_series_b, 1763-l16bbb_series_a, 1763-l16bbb_series_b, 1763-l16bwa_series_a, plus 5 other product variants.
Executive Summary
A "Reusing a Nonce, Key Pair in Encryption" issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions; 1763-L16BWA, Series A and B, Version 16.00 and prior versions; and 1763-L16DWD, Series A and B, Version 16.00 and prior versions and Allen-Bradley MicroLogix 1400 programmable logic controllers 1766-L32AWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWAA, Series A and B, Version 16.00 and prior versions; 1766-L32BXB, Series A and B, Version 16.00 and prior versions; 1766-L32BXBA, Series A and B, Version 16.00 and prior versions; and 1766-L32AWAA, Series A and B, Version 16.00 and prior versions. The affected product reuses nonces, which may allow an attacker to capture and replay a valid request until the nonce is changed.
Why It Matters
CVE-2017-7902 is rated CRITICAL severity, requiring immediate attention from security teams.
CVSS Base Score: 9.8/10
Affected Technologies
Vendors: rockwellautomation
Products: 1763-l16awa_series_a, 1763-l16awa_series_b, 1763-l16bbb_series_a, 1763-l16bbb_series_b, 1763-l16bwa_series_a, 1763-l16bwa_series_b, 1763-l16dwd_series_a, 1763-l16dwd_series_b, ab_micrologix_controller, 1766-l32awa_series_a, 1766-l32awa_series_b, 1766-l32awaa_series_a, 1766-l32awaa_series_b, 1766-l32bwa_series_a, 1766-l32bwa_series_b, 1766-l32bwaa_series_a, 1766-l32bwaa_series_b, 1766-l32bxb_series_a, 1766-l32bxb_series_b, 1766-l32bxba_series_a, 1766-l32bxba_series_b
🛡️What Defenders Should Check
Use Vulnios to continuously monitor your exposure to CVE-2017-7902 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-2017-7903 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
- Critical Vulnerability: CVE-2017-7898 — rockwellautomation — 1763-l16awa_series_a, 1763-l16awa_series_b
- Critical Vulnerability: CVE-2016-9343 — rockwellautomation — softlogix_5800_controller_firmware, softlogix_5800_controller
Frequently Asked Questions
What is CVE-2017-7902?
CVE-2017-7902 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. A "Reusing a Nonce, Key Pair in Encryption" issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prio
Am I affected?
Check whether your environment runs 1763-l16awa_series_a, 1763-l16awa_series_b, 1763-l16bbb_series_a, 1763-l16bbb_series_b, 1763-l16bwa_series_a. 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-2017-7902. 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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