CVE-2020-6981Network attack vector

Unauthenticated system access via hard-coded password

Published Mar 24, 2020 · Updated Aug 4, 2024

Authentication bypass in Moxa EDS-G516E Series firmware 5.2 and earlier allows remote attackers to gain unauthenticated system access. Moxa identifies a hard-coded password but has not published the affected authentication interface or the code path that accepts it. Network reachability to an affected switch is the documented gate, and the consequence is system access without proper authentication; Moxa does not define the access level.

CVSS severity9.8
Critical
EPSS probability2.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Moxa EDS-G516E Series firmware 5.2 and earlier allows remote attackers to gain unauthenticated system access. Moxa identifies a hard-coded password but has not published the affected authentication interface or the code path that accepts it. Network reachability to an affected switch is the documented gate, and the consequence is system access without proper authentication; Moxa does not define the access level.

The record

CVE
CVE-2020-6981
Published
Mar 24, 2020
Updated
Aug 4, 2024
Vendor
Moxa
Product
EDS-G516E Series
Classifications
CWE-798, T1078
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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Moxa EDS-G516E Series firmware, Version 5.2 or lower

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · EDS-G516E Seriesversion=Moxa EDS-G516E Series firmware, Version 5.2 or lower

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

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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