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CVE-2017-7902

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-06-30 · updated 2026-06-17
• Weakness: CWE-323

Description

A "Reusing a Nonce, Key Pair in Encryption" 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. The affected product reuses nonces, which may allow an attacker to capture and replay a valid request until the nonce is changed.

Affected products

• Rockwellautomation 1763-L16Awa Series A: through 16.000
• Rockwellautomation 1763-L16Awa Series B: through 16.000
• Rockwellautomation 1763-L16Bbb Series A: through 16.000
• Rockwellautomation 1763-L16Bbb Series B: through 16.000
• Rockwellautomation 1763-L16Bwa Series A: through 16.000
• Rockwellautomation 1763-L16Bwa Series B: through 16.000
• Rockwellautomation 1763-L16Dwd Series A: through 16.000
• Rockwellautomation 1763-L16Dwd Series B: through 16.000
• Rockwellautomation 1766-L32Awa Series A: through 16.000
• Rockwellautomation 1766-L32Awa Series B: through 16.000
• Rockwellautomation 1766-L32Awaa Series A: through 16.000
• Rockwellautomation 1766-L32Awaa Series B: through 16.000
• Rockwellautomation 1766-L32Bwa Series A: through 16.000
• Rockwellautomation 1766-L32Bwa Series B: through 16.000
• Rockwellautomation 1766-L32Bwaa Series A: through 16.000
• Rockwellautomation 1766-L32Bwaa Series B: through 16.000
• Rockwellautomation 1766-L32Bxb Series A: through 16.000
• Rockwellautomation 1766-L32Bxb Series B: through 16.000
• Rockwellautomation 1766-L32Bxba Series A: through 16.000
• Rockwellautomation 1766-L32Bxba Series B: through 16.000

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

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