What is the CVSS score of CVE-2017-7901?

CVE-2017-7901 has a CVSS 3.0 base score of 8.6 (High). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H. EPSS exploitation probability: 0.1%.

Is there a patch available for CVE-2017-7901?

Yes, a patch is available for CVE-2017-7901. Update the affected software to the latest version immediately.

1763 L16Awa Series A CVE-2017-7901

HIGH

Predictable Value Range from Previous Values (CWE-343)

2017-06-30 ics-cert@hq.dhs.gov

Denial Of Service Rockwell 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

8.6

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

8.6 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Lifecycle Timeline

CVE Published

Jun 30, 2017 - 03:29 cve.org

HIGH 8.6

DescriptionCVE.org

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.

AnalysisAI

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. Rated high severity (CVSS 8.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-343. 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 include: 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. Version information: Version 16.00.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.