CVE-2021-20650Network attack vector

Settings alteration via cross-site administrator requests

Published Feb 12, 2021 · Updated Aug 3, 2024

CSRF in the web setup page of ELECOM NCC-EWF100RMWH2 allows remote attackers to alter device settings through an administrator's session. The page accepts forged cross-site requests as authorized session actions; ELECOM has not disclosed the affected endpoint or validation defect. An administrator must visit a malicious page while logged in, and the request can alter settings or start the telnet daemon.

CVSS severity4.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in the web setup page of ELECOM NCC-EWF100RMWH2 allows remote attackers to alter device settings through an administrator's session. The page accepts forged cross-site requests as authorized session actions; ELECOM has not disclosed the affected endpoint or validation defect. An administrator must visit a malicious page while logged in, and the request can alter settings or start the telnet daemon.

The record

CVE
CVE-2021-20650
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
ELECOM CO., LTD.
Product
NCC-EWF100RMWH2
Classifications
CWE-352, CAPEC-62, T1204.001
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?

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

  1. Affected versionversion=NCC-EWF100RMWH2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ELECOM CO., LTD. · NCC-EWF100RMWH2version=NCC-EWF100RMWH2

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
2.6IPA/JPCERT/CCAV:N/AC:H/Au:N/C:N/I:P/A:N
4.3IPA/JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1204.001Malicious Link

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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