VIR Vulnerability Intelligence Relay

CVE-2017-7901

high
Published 2017-06-30 · Modified 2026-05-13
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CVSS v3
8.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
8.6

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.

Predictions

Exploit likelihood
91%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Application impact
VendorProductVersionsFixed
rockwellautomation1763-l16awa_series_a{"endIncluding":"16.000"}
rockwellautomation1763-l16awa_series_b{"endIncluding":"16.000"}
rockwellautomation1763-l16bbb_series_a{"endIncluding":"16.000"}
rockwellautomation1763-l16bbb_series_b{"endIncluding":"16.000"}
rockwellautomation1763-l16bwa_series_a{"endIncluding":"16.000"}
rockwellautomation1763-l16bwa_series_b{"endIncluding":"16.000"}
rockwellautomation1763-l16dwd_series_a{"endIncluding":"16.000"}
rockwellautomation1763-l16dwd_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32awa_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32awa_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32awaa_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32awaa_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32bwa_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32bwa_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32bwaa_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32bwaa_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32bxb_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32bxb_series_b{"endIncluding":"16.000"}
rockwellautomation1766-l32bxba_series_a{"endIncluding":"16.000"}
rockwellautomation1766-l32bxba_series_b{"endIncluding":"16.000"}

References

CWEs

CWE-343 CWE-330

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.