CVE-2017-7901: Rockwellautomation 1763-l16awa Series A
High severity, CVSS 8.6. EPSS: 6.7% chance of exploitation in the next 30 days.
A Predictable Value Range from Previous Values 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. Insufficiently random TCP initial sequence numbers are generated, which may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections, resulting in a denial of service for the target device.
Affected products
- Rockwellautomation 1763-l16awa Series A: up to and including 16.000
- Rockwellautomation 1763-l16awa Series B: up to and including 16.000
- Rockwellautomation 1763-l16bbb Series A: up to and including 16.000
- Rockwellautomation 1763-l16bbb Series B: up to and including 16.000
- Rockwellautomation 1763-l16bwa Series A: up to and including 16.000
- Rockwellautomation 1763-l16bwa Series B: up to and including 16.000
- Rockwellautomation 1763-l16dwd Series A: up to and including 16.000
- Rockwellautomation 1763-l16dwd Series B: up to and including 16.000
- Rockwellautomation 1766-l32awa Series A: up to and including 16.000
- Rockwellautomation 1766-l32awa Series B: up to and including 16.000
- Rockwellautomation 1766-l32awaa Series A: up to and including 16.000
- Rockwellautomation 1766-l32awaa Series B: up to and including 16.000
- Rockwellautomation 1766-l32bwa Series A: up to and including 16.000
- Rockwellautomation 1766-l32bwa Series B: up to and including 16.000
- Rockwellautomation 1766-l32bwaa Series A: up to and including 16.000
- Rockwellautomation 1766-l32bwaa Series B: up to and including 16.000
- Rockwellautomation 1766-l32bxb Series A: up to and including 16.000
- Rockwellautomation 1766-l32bxb Series B: up to and including 16.000
- Rockwellautomation 1766-l32bxba Series A: up to and including 16.000
- Rockwellautomation 1766-l32bxba Series B: up to and including 16.000
Published 2017-06-30. Last modified 2026-06-17.