How severe is CVE-2021-20662?

CVE-2021-20662 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-20662 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20662?

CVE-2021-20662 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20662?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-20662 published?

CVE-2021-20662 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-20662

CVE-2021-20662 is a high-severity vulnerability in Contec Sv-cpt-mc310 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Contec Sv-cpt-mc310 Firmware
Published: 2021-02-24
Last modified: 2026-06-17

Description

Missing authentication for critical function in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an attacker to alter the setting information without the access privileges via unspecified vectors.

Frequently asked questions

What is CVE-2021-20662?: Missing authentication for critical function in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an attacker to alter the setting information without the access privileges via unspecified vectors.
How severe is CVE-2021-20662?: CVE-2021-20662 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-20662 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20662?: CVE-2021-20662 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20662?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-20662 published?: CVE-2021-20662 was published on 2021-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:contec:sv-cpt-mc310_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Contec Sv-cpt-mc310 Firmware

CVE-2022-31374 — Critical (CVSS 9.8): An arbitrary file upload vulnerability /images/background/1.php in of SolarView Compact 6.0 allows attackers to execute…
CVE-2022-29303 — Critical (CVSS 9.8): SolarView Compact ver.6.00 was discovered to contain a command injection vulnerability via conf_mail.php.
CVE-2021-20658 — Critical (CVSS 9.8): SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an attacker to execute arbitrary OS commands with the web server…
CVE-2023-27521 — High (CVSS 8.8): OS command injection vulnerability in the mail setting page of SolarView Compact SV-CPT-MC310 versions prior to…
CVE-2023-27518 — High (CVSS 8.8): Buffer overflow vulnerability in the multiple setting pages of SolarView Compact SV-CPT-MC310 versions prior to…
CVE-2023-27514 — High (CVSS 8.8): OS command injection vulnerability in the download page of SolarView Compact SV-CPT-MC310 versions prior to Ver.8.10…

All CVEs affecting Contec Sv-cpt-mc310 Firmware →

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities

CVE-2026-54309 — Critical (CVSS 10.0): n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP…
CVE-2026-50242 — Critical (CVSS 10.0): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429…
CVE-2026-49257 — Critical (CVSS 10.0): mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1…
CVE-2026-46846 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Security Framework).…
CVE-2026-46803 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Security Framework).…
CVE-2026-46800 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Sites product of Oracle Fusion Middleware (component: WebCenter Sites).…

Browse all CWE-306 (Missing Authentication for Critical Function) vulnerabilities →