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CVE-2020-7491· NVD / CVE Program· CNA schneider

**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 vis

**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.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Jul 23, 2020
Updated
Jun 16, 2026
EPSS
1.3% · 69th percentile
CWE
—
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

Affected systems

VendorProduct
schneider-electrictricon tcm 4351 firmware
schneider-electrictricon tcm 4351
schneider-electrictricon tcm 4352 firmware
schneider-electrictricon tcm 4352
schneider-electrictricon tcm 4351a firmware
schneider-electrictricon tcm 4351a
schneider-electrictricon tcm 4351b firmware
schneider-electrictricon tcm 4351b
schneider-electrictricon tcm 4352a firmware
schneider-electrictricon tcm 4352a
schneider-electrictricon tcm 4352b firmware
schneider-electrictricon tcm 4352b

and 2 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • schneider-electric tricon tcm 4351 firmware10.2.0 and later · before 10.5.4
  • schneider-electric tricon tcm 4351a firmware10.2.0 and later · before 10.5.4
  • schneider-electric tricon tcm 4351b firmware10.2.0 and later · before 10.5.4
  • schneider-electric tricon tcm 4352 firmware10.2.0 and later · before 10.5.4
  • schneider-electric tricon tcm 4352a firmware10.2.0 and later · before 10.5.4
  • schneider-electric tricon tcm 4352b firmware10.2.0 and later · before 10.5.4
  • schneider-electric tristation 1131 firmware1.0.0 and later · up to 4.9.0 inclusive
  • schneider-electric tristation 1131 firmware4.10.0 and later · up to 4.12.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (schneider). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Tricon system versions 10.2.0 through 10.5.3

    • Tricon system versions 10.2.0 through 10.5.3affected

Same product

schneider-electric: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-7486**VERSION NOT SUPPORTED WHEN ASSIGNED** A vulnerability could cause TCM modules to reset when under high network load in TCM v10.4.x and in
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records