A Predictable Value Range from Previous Values issue was discovered in Rockwell…
Priority MEDIUM 49CWE-343Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.09046 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 | Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 | — | No fix listed | CNA |
- Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 Vendor— Affected Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 Fixed in — No fix listed CNA
CPE configurations NVD · 22
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rockwellautomation:1763-l16awa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16awa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16bbb_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16bbb_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16bwa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16bwa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16dwd_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1763-l16dwd_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:h:rockwellautomation:ab_micrologix_controller:1100:*:*:*:*:*:*:* | 1100 | Running on | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32awa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
- cpe:2.3:a:rockwellautomation:1763-l16awa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16awa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16bbb_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16bbb_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16bwa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16bwa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16dwd_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1763-l16dwd_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:h:rockwellautomation:ab_micrologix_controller:1100:*:*:*:*:*:*:* Versions 1100 Running on ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32awa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
Show 12 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rockwellautomation:1766-l32awa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32awaa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32awaa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bwa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bwa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bwaa_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bwaa_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bxb_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bxb_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bxba_series_a:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:a:rockwellautomation:1766-l32bxba_series_b:*:*:*:*:*:*:*:* | up to 16.000 | Vulnerable | Rockwell |
| cpe:2.3:h:rockwellautomation:ab_micrologix_controller:1400:*:*:*:*:*:*:* | 1400 | Running on | Rockwell |
- cpe:2.3:a:rockwellautomation:1766-l32awa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32awaa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32awaa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bwa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bwa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bwaa_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bwaa_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bxb_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bxb_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bxba_series_a:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:a:rockwellautomation:1766-l32bxba_series_b:*:*:*:*:*:*:*:* Versions up to 16.000 Vulnerable ·Rockwell
- cpe:2.3:h:rockwellautomation:ab_micrologix_controller:1400:*:*:*:*:*:*:* Versions 1400 Running on ·Rockwell
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-7901
- 2026-10-03 Alias added: GHSA-9mhw-mx58-2jch
- 2026-10-26 EPSS moved to the 95th–99th percentile
References
More Rockwell 1763-l16awa Series A vulnerabilities
- TI-2017-05509 Missing brute-force protection in Rockwell Automation Allen-Bradley MicroLogix 1100 and… CVSS 3.1CRITICAL 9.8
- TI-2017-05513 A Weak Password Requirements issue was discovered in Rockwell Automation Allen-Bradley… CVSS 3.1CRITICAL 9.8
- TI-2016-00782 Stack-based buffer overflow on Rockwell Automation Allen-Bradley MicroLogix 1100 devices… CVSS 3.0CRITICAL 9.8
- TI-2017-05510 Information disclosure in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 CVSS 3.0CRITICAL 9.8
- TI-2017-05512 A "Reusing a Nonce, Key Pair in Encryption" issue was discovered in Rockwell Automation… CVSS 3.0CRITICAL 9.8
- TI-2016-07614 An issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 controller… CVSS 3.0HIGH 7.3
Sources
- CVE-2017-7901 · CVE Program
- CVE-2017-7901 · NVD
- FIRST EPSS
- GHSA-9mhw-mx58-2jch · GitHub Advisory Database · CC BY 4.0
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