CVE-2021-20643Network attack vector

Unauthenticated administrator password change via crafted request

Published Feb 12, 2021 · Updated Aug 3, 2024

Improper access control in ELECOM LD-PS/U1 allows remote attackers to change its administrative password via a crafted request. ELECOM and JVN have not disclosed the request handler, parameter, or missing authorization check that permits the password write. No authentication or user interaction is required, and the bounded impact is unauthorized replacement of the device's administrative credential.

CVSS severity7.5
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in ELECOM LD-PS/U1 allows remote attackers to change its administrative password via a crafted request. ELECOM and JVN have not disclosed the request handler, parameter, or missing authorization check that permits the password write. No authentication or user interaction is required, and the bounded impact is unauthorized replacement of the device's administrative credential.

The record

CVE
CVE-2021-20643
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
ELECOM CO., LTD.
Product
LD-PS/U1
Classifications
CWE-284, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

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  1. Affected versionversion=LD-PS/U1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ELECOM CO., LTD. · LD-PS/U1version=LD-PS/U1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.0JPCERT/CCAV:N/AC:L/Au:N/C:N/I:P/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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 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-284Improper Access Control
T1098Account Manipulation

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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