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CVE-2020-6987· NVD / CVE Program· CNA icscert

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, the affected products use a weak c

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.97% (FIRST EPSS); higher than 60.9% of all records.
  • 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.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, the affected products use a weak cryptographic algorithm, which may allow confidential information to be disclosed.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Mar 24, 2020
Updated
Jun 16, 2026
EPSS
1.0% · 61th percentile

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 · 1.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-6987

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
moxapt-7528-24tx-hv firmware
moxapt-7528-24tx-hv
moxapt-7528-24tx-hv-hv firmware
moxapt-7528-24tx-hv-hv
moxapt-7528-24tx-wv firmware
moxapt-7528-24tx-wv
moxapt-7528-24tx-wv-hv firmware
moxapt-7528-24tx-wv-hv
moxapt-7528-24tx-wv-wv firmware
moxapt-7528-24tx-wv-wv
moxapt-7528-12msc-12tx-4gsfp-hv firmware
moxapt-7528-12msc-12tx-4gsfp-hv

and 98 more

Affected versions

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

  • moxa pt-7528-12msc-12tx-4gsfp-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-12msc-12tx-4gsfp-hv-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-12msc-12tx-4gsfp-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-12msc-12tx-4gsfp-wv-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-12mst-12tx-4gsfp-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-12mst-12tx-4gsfp-hv-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-12mst-12tx-4gsfp-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-12mst-12tx-4gsfp-wv-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-16msc-8tx-4gsfp-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-16msc-8tx-4gsfp-hv-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-16msc-8tx-4gsfp-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-16msc-8tx-4gsfp-wv-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-16mst-8tx-4gsfp-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-16mst-8tx-4gsfp-hv-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-16mst-8tx-4gsfp-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-16mst-8tx-4gsfp-wv-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-20msc-4tx-4gsfp-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-20msc-4tx-4gsfp-hv-hv firmwareup to 4.0 inclusive
  • moxa pt-7528-20msc-4tx-4gsfp-wv firmwareup to 4.0 inclusive
  • moxa pt-7528-20msc-4tx-4gsfp-wv-wv firmwareup to 4.0 inclusive

Versions reported by the vendor

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

  • n/a Moxa PT-7528 series firmware, Version 4.0 or lower, PT-7828 series firmware, Version 3.9 or lower

    • Moxa PT-7528 series firmware, Version 4.0 or lower, PT-7828 series firmware, Version 3.9 or loweraffected

Same product

moxa: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-6985In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, these devices use a hard-coded ser
    40Plan
  • CVE-2020-6989In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, a buffer overflow in the web serve
    40Plan
  • CVE-2020-6995In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, the application utilizes weak pass
    39Monitor
  • CVE-2020-6993In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, an attacker can gain access to sen
    30Monitor
  • CVE-2020-6983In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, the affected products use a hard-c
    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)

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm

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.

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