CVE-2020-6987Network attack vector

Information disclosure via weak cryptographic implementation

Published Mar 24, 2020 · Updated Aug 4, 2024

Weak cryptography in Moxa PT-7528 firmware 4.0 and earlier and PT-7828 firmware 3.9 and earlier allows remote attackers to read confidential data. Moxa states that the firmware uses a weak algorithm and improperly implements a cryptographic function, but does not identify the algorithm, function, data path, or exposed data. Network access without authentication is sufficient, and the reported consequence is limited to confidentiality with no integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in Moxa PT-7528 firmware 4.0 and earlier and PT-7828 firmware 3.9 and earlier allows remote attackers to read confidential data. Moxa states that the firmware uses a weak algorithm and improperly implements a cryptographic function, but does not identify the algorithm, function, data path, or exposed data. Network access without authentication is sufficient, and the reported consequence is limited to confidentiality with no integrity or availability impact.

The record

CVE
CVE-2020-6987
Published
Mar 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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