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CVE-2017-7901

UnknownEPSS 6.62%

Last modified

CVE-2017-7901 is a vulnerability of currently unknown severity. 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. EPSS estimates a 6.62% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
6.62%

93.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Rockwellautomation1763-L16awa Series A<= 16.000
Rockwellautomation1763-L16awa Series B<= 16.000
Rockwellautomation1763-L16bbb Series A<= 16.000
Rockwellautomation1763-L16bbb Series B<= 16.000
Rockwellautomation1763-L16bwa Series A<= 16.000
Rockwellautomation1763-L16bwa Series B<= 16.000
Rockwellautomation1763-L16dwd Series A<= 16.000
Rockwellautomation1763-L16dwd Series B<= 16.000
Rockwellautomation1766-L32awa Series A<= 16.000
Rockwellautomation1766-L32awa Series B<= 16.000
Rockwellautomation1766-L32awaa Series A<= 16.000
Rockwellautomation1766-L32awaa Series B<= 16.000
Rockwellautomation1766-L32bwa Series A<= 16.000
Rockwellautomation1766-L32bwa Series B<= 16.000
Rockwellautomation1766-L32bwaa Series A<= 16.000
Rockwellautomation1766-L32bwaa Series B<= 16.000
Rockwellautomation1766-L32bxb Series A<= 16.000
Rockwellautomation1766-L32bxb Series B<= 16.000
Rockwellautomation1766-L32bxba Series A<= 16.000
Rockwellautomation1766-L32bxba Series B<= 16.000

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2017-7901?
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.
How severe is CVE-2017-7901?
Severity scoring for CVE-2017-7901 is pending analysis. The EPSS model estimates a 6.62% probability of exploitation in the next 30 days.
How do I fix CVE-2017-7901?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-7901?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST