CVE-2021-20660Network attack vector

Arbitrary script execution via undisclosed XSS vector

Published Feb 24, 2021 · Updated Aug 3, 2024

Cross-site scripting in CONTEC SolarView Compact SV-CPT-MC310 before 6.5 allows remote attackers to inject arbitrary scripts. Published advisories do not identify the affected page, parameter, or operation that places untrusted input into web content. Execution requires a logged-in user to encounter the affected content, allowing script access to browser-visible data or actions without reported service interruption.

CVSS severity6.1
Medium
EPSS probability47.16%
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 CONTEC SolarView Compact SV-CPT-MC310 before 6.5 allows remote attackers to inject arbitrary scripts. Published advisories do not identify the affected page, parameter, or operation that places untrusted input into web content. Execution requires a logged-in user to encounter the affected content, allowing script access to browser-visible data or actions without reported service interruption.

The record

CVE
CVE-2021-20660
Published
Feb 24, 2021
Updated
Aug 3, 2024
Vendor
CONTEC Co., Ltd.
Product
SolarView Compact
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 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=SV-CPT-MC310 prior to Ver.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CONTEC Co., Ltd. · SolarView Compactversion=SV-CPT-MC310 prior to Ver.6.5

Published CVSS scores

6.1JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3JPCERT/CC and IPAAV:N/AC:M/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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