{"cve":"CVE-2017-7901","nvd":{"published":"2017-06-30T03:29:00.797","modified":"2026-06-17T01:25:25.657","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","score":8.6},"cwes":["CWE-330","CWE-343"],"references":["http://www.securitytracker.com/id/1038546","https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04","http://www.securitytracker.com/id/1038546","https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04"],"products":["rockwellautomation:1763-l16awa_series_a","rockwellautomation:1763-l16awa_series_b","rockwellautomation:1763-l16bbb_series_a","rockwellautomation:1763-l16bbb_series_b","rockwellautomation:1763-l16bwa_series_a","rockwellautomation:1763-l16bwa_series_b","rockwellautomation:1763-l16dwd_series_a","rockwellautomation:1763-l16dwd_series_b","rockwellautomation:1766-l32awa_series_a","rockwellautomation:1766-l32awa_series_b","rockwellautomation:1766-l32awaa_series_a","rockwellautomation:1766-l32awaa_series_b","rockwellautomation:1766-l32bwa_series_a","rockwellautomation:1766-l32bwa_series_b","rockwellautomation:1766-l32bwaa_series_a","rockwellautomation:1766-l32bwaa_series_b","rockwellautomation:1766-l32bxb_series_a","rockwellautomation:1766-l32bxb_series_b","rockwellautomation:1766-l32bxba_series_a","rockwellautomation:1766-l32bxba_series_b"],"source":"nvd","synced_at":"2026-10-19T20:43:44.556243339+00:00"},"epss":{"cve":"CVE-2017-7901","score":0.09046,"percentile":0.95283,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}