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Fencer Vulns
critical 9.8

CVE-2017-7902 json

A "Reusing a Nonce, Key Pair in Encryption" issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic co…

published 2017-06-30 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16873

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-17-115-04 updated cvss 5.4

Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400

  • Rockwell Automation 1763-L16AWA Series A and B <= 16.00 Rockwell Automation 1763-L16BBB Series A and B <= 16.00 Rockwell Automation 1763-L16BWA Series A and B <= 16.00 Rockwell Automation 1763-L16DWD Series A and B <= 16.00 Rockwell Automation 1766-L32AWA Series A and B <= 16.00 Rockwell Automation 1766-L32AWAA Series A and B <= 16.00
    +4 more products
    Rockwell Automation 1766-L32BWA Series A and B <= 16.00 Rockwell Automation 1766-L32BWAA Series A and B <= 16.00 Rockwell Automation 1766-L32BXB Series A and B <= 16.00 Rockwell Automation 1766-L32BXBA Series A and B <= 16.00
    affected: mitigation “Rockwell Automation's new firmware version for the Allen-Bradley MicroLogix 1400 Series B controllers, FRN 21.00” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.56% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400

Classification

Weakness
  • CWE-323 Reusing a Nonce, Key Pair in Encryption
  • CWE-330 Use of Insufficiently Random Values

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.