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Fencer Vulns
high 7.5

CVE-2020-7491 json

**VERSION NOT SUPPORTED WHEN ASSIGNED** A legacy debug port account in TCMs installed in Tricon system versions 10.2.0 through 10.5.3 is vi…

published 2020-07-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28616

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

**VERSION NOT SUPPORTED WHEN ASSIGNED** A legacy debug port account in TCMs installed in Tricon system versions 10.2.0 through 10.5.3 is visible on the network and could allow inappropriate access. This vulnerability was remediated in TCM version 10.5.4.

Patch / fix

  • schneider-electric tricon_tcm_4351_firmware 10.5.4
  • schneider-electric tricon_tcm_4352_firmware 10.5.4
  • schneider-electric tricon_tcm_4351a_firmware 10.5.4
  • schneider-electric tricon_tcm_4351b_firmware 10.5.4
  • schneider-electric tricon_tcm_4352a_firmware 10.5.4
  • schneider-electric tricon_tcm_4352b_firmware 10.5.4

Vendor advisories

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

cisa ICSA-20-205-01 updated cvss 10.0

Schneider Electric Triconex TriStation and Tricon Communication Module

  • Schneider Electric Software, LLC Tricon Communications Module (TCM) Models 4351 4352 4351A/B and 4352A/B installed in Tricon >= 10.0, <= 10.5.3 Schneider Electric Software, LLC TriStation 1131 >= 1.0., <=4.9.0, 4.10.0, 4.12.0
    affected: mitigation “Schneider Electric notified customers of updated product availability via direct-to-customer notification and fixed versions of these offers are available for download here.” pasupport.schneider-electric.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

1.31% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a Tricon system versions 10.2.0 through 10.5.3

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.