CVE-2021-20710Network attack vector

Cross-site scripting via crafted management request

Published Apr 26, 2021 · Updated Aug 3, 2024

Cross-site scripting in Aterm WG2600HS firmware 1.5.1 and earlier allows remote attackers to execute scripts in a user's browser via crafted requests. The vulnerable management interface accepts a specially crafted request at a specific URL and fails to neutralize script content before the quick-setting web page renders it. A victim must access the management page from the LAN side, and the script can attack the browser and connected LAN devices without providing router command execution.

CVSS severity6.1
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Aterm WG2600HS firmware 1.5.1 and earlier allows remote attackers to execute scripts in a user's browser via crafted requests. The vulnerable management interface accepts a specially crafted request at a specific URL and fails to neutralize script content before the quick-setting web page renders it. A victim must access the management page from the LAN side, and the script can attack the browser and connected LAN devices without providing router command execution.

The record

CVE
CVE-2021-20710
Published
Apr 26, 2021
Updated
Aug 3, 2024
Vendor
NEC Platforms, Ltd.
Product
Aterm WG2600HS
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 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=firmware Ver1.5.1 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NEC Platforms, Ltd. · Aterm WG2600HSversion=firmware Ver1.5.1 and earlier

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1JVNCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2.6JVNAV:N/AC:H/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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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