CVE-2017-7901

Published Jun 30, 2017

Last updated 7 years ago

Overview

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.
Source: ics-cert@hq.dhs.gov
NVD status: Modified

Risk scores

CVSS 3.0

Type: Primary
Base score: 8.6
Impact score: 4.7
Exploitability score: 3.9
Vector string: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Severity: HIGH

CVSS 2.0

Type: Primary
Base score: 9
Impact score: 8.5
Exploitability score: 10
Vector string: AV:N/AC:L/Au:N/C:P/I:P/A:C

Weaknesses

nvd@nist.gov: CWE-330
ics-cert@hq.dhs.gov: CWE-343

Hype score: Not currently trending

Configurations

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Overview

Risk scores

CVSS 3.0

CVSS 2.0

Weaknesses

Social media

Configurations

References