{"id":"CVE-2017-7902","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-7902","generatedAt":"2026-10-28T21:49:14.245Z","title":"The affected product reuses nonces, which may allow an attacker to capture and replay a valid request until the nonce is changed.","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.","published":"2017-06-30T03:29:01.000Z","lastModified":"2026-06-17T01:25:26.000Z","status":"Modified","sourceIdentifier":"ics-cert@hq.dhs.gov","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-323","CWE-330"],"affected":["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","rockwellautomation/1763-l16bwa series b","rockwellautomation/1763-l16dwd series a","rockwellautomation/1763-l16dwd series b","rockwellautomation/1766-l32awa series a","rockwellautomation/1766-l32awa series b","rockwellautomation/1766-l32awaa series a","rockwellautomation/1766-l32awaa series b","rockwellautomation/1766-l32bwa series a","rockwellautomation/1766-l32bwa series b","rockwellautomation/1766-l32bwaa series a","rockwellautomation/1766-l32bwaa series b","rockwellautomation/1766-l32bxb series a","rockwellautomation/1766-l32bxb series b","rockwellautomation/1766-l32bxba series a","rockwellautomation/1766-l32bxba series b"],"epss":{"score":0.02559,"percentile":0.85,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.securitytracker.com/id/1038546","tags":["Third Party Advisory","VDB Entry"],"source":"ics-cert@hq.dhs.gov"},{"url":"https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04","tags":["Patch","Third Party Advisory","US Government Resource"],"source":"ics-cert@hq.dhs.gov"},{"url":"http://www.securitytracker.com/id/1038546","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04","tags":["Patch","Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-7902","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}