How severe is CVE-2021-20657?

CVE-2021-20657 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-20657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20657?

CVE-2021-20657 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20657?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20657 published?

CVE-2021-20657 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-20657

CVE-2021-20657 is a medium-severity vulnerability in Contec Sv-cpt-mc310 Firmware with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Contec Sv-cpt-mc310 Firmware
Published: 2021-02-24
Last modified: 2026-06-17

Description

Improper access control vulnerability in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an authenticated attacker to obtain and/or alter the setting information without the access privilege via unspecified vectors.

Frequently asked questions

What is CVE-2021-20657?: Improper access control vulnerability in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an authenticated attacker to obtain and/or alter the setting information without the access privilege via unspecified vectors.
How severe is CVE-2021-20657?: CVE-2021-20657 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-20657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20657?: CVE-2021-20657 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20657 published?: CVE-2021-20657 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…
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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…

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