CVE-2021-20662

Unauthorized settings changes via missing authentication

Published Feb 24, 2021 · Updated Aug 3, 2024

Authentication bypass in CONTEC SolarView Compact SV-CPT-MC310 before 6.5 allows remote attackers to alter device settings. The published advisory identifies missing authentication for a critical function but does not disclose the affected endpoint or failed authentication check. Access from an adjacent network is sufficient, and the documented consequence is unauthorized modification of configuration data.

CVSS severity4.3
Medium
EPSS probability2.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in CONTEC SolarView Compact SV-CPT-MC310 before 6.5 allows remote attackers to alter device settings. The published advisory identifies missing authentication for a critical function but does not disclose the affected endpoint or failed authentication check. Access from an adjacent network is sufficient, and the documented consequence is unauthorized modification of configuration data.

The record

CVE
CVE-2021-20662
Published
Feb 24, 2021
Updated
Aug 3, 2024
Vendor
CONTEC Co., Ltd.
Product
SolarView Compact
Classifications
CWE-306, T0836
Attack vector
adjacent
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 vectoradjacent
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
4.3JPCERT/CCCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.3JPCERT/CCAV:A/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0836Modify Parameter

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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