Description
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.
Published: 2017-06-30
Score: 8.6 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2017-16872 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.
History

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Subscriptions

Rockwellautomation 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 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 Ab Micrologix Controller
cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2024-08-05T16:19:29.159Z

Reserved: 2017-04-18T00:00:00.000Z

Link: CVE-2017-7901

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2017-06-30T03:29:00.797

Modified: 2025-04-20T01:37:25.860

Link: CVE-2017-7901

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses