No exploitation reportedFix available

CVE-2017-7902

No exploitation reported by the sources we read.

Published2017-06-30
WeaknessCWE-323 · CWE-330

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2017-06-3003:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-7902?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-7902?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Rockwellautomation 1763-l16awa series aversion to verify

Branch	Affected	Fixed in	Source
16.0	≤ 16.000	no fix published	NVD

Rockwellautomation 1763-l16awa series bversion to verify

Branch	Affected	Fixed in	Source
16.0	≤ 16.000	no fix published	NVD

Rockwellautomation 1763-l16bbb series aversion to verify

Branch	Affected	Fixed in	Source
16.0	≤ 16.000	no fix published	NVD

17 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-17-115-04 CISA10 known affected
Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
1766-L32BXB Series A and B: Version 16.00 and prior versions; · 1763-L16AWA Series A and B: Version 16.00 and prior versions; · 1766-L32AWA Series A and B: Version 16.00 and prior versions; · +7 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsRockwell Automation has released a new firmware version for the Allen-Bradley MicroLogix 1400 Series B controllers, FRN 21.00, to address the identified vulnerabilities. Rockwell Automation encourages users to apply the latest firmware versions that address the identified vulnerabilities.
Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsRockwell Automation's new firmware version for the Allen-Bradley MicroLogix 1400 Series B controllers, FRN 21.00
Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsThere are no firmware versions to address these vulnerabilities in the Allen-Bradley MicroLogix 1100 or MicroLogix 1400 Series A controllers, but Rockwell Automation has offered some compensating controls. Rockwell Automation reports that users can disable the web server on the Allen-Bradley MicroL…
Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsRockwell Automation recommends that if it is not needed, users should consider disabling the web server to further mitigate these threats.
Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsDisable the web server on the MicroLogix 1100 and 1400 controllers, if not needed, as it is enabled by default. See Knowledge Base article: 732398 for detailed instructions on disabling the web server. The Web Server Tech Note, KB: 732398 - How to Disable the Web Server in MicroLogix 1100 and 1400
Mitigation from the vendor CISA ICSA-17-115-04 · 10 productsSet the mode to RUN via LCD soft keyswitch to prohibit any re-enabling of the web server while the keyswitch is in this mode.

Advisories and patches

ics-cert.us-cert.govPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-323read 2026-10-23
NVDweakness (CWE)CWE-330read 2026-10-23
FIRST EPSSEPSS score2.6 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-06-30
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-7902?

Is CVE-2017-7902 actively exploited?

Active exploitation of CVE-2017-7902 has not been confirmed. Its EPSS score was 2.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-7902?

CVE-2017-7902 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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