CVE-2021-20621Network attack vector

Unintended administrator operations via forged requests

Published Jan 28, 2021 · Updated Aug 3, 2024

CSRF in NEC Aterm WG2600HP and WG2600HP2 firmware 1.0.2 and earlier allows remote attackers to perform unintended operations. Public advisories do not identify the affected management endpoint or the request-validation failure that accepts the forged action. An administrator must remain logged in to the device and visit a specially crafted page; the resulting operation is not further specified.

CVSS severity4.3
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in NEC Aterm WG2600HP and WG2600HP2 firmware 1.0.2 and earlier allows remote attackers to perform unintended operations. Public advisories do not identify the affected management endpoint or the request-validation failure that accepts the forged action. An administrator must remain logged in to the device and visit a specially crafted page; the resulting operation is not further specified.

The record

CVE
CVE-2021-20621
Published
Jan 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, CAPEC-62
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

4.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
2.6JPCERT/CCAV:N/AC:H/Au:N/C:N/I:P/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

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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