How severe is CVE-2021-20656?

CVE-2021-20656 has a CVSS 3.x base score of 4.3, 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 none, and availability none.

Is CVE-2021-20656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20656?

CVE-2021-20656 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20656?

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

When was CVE-2021-20656 published?

CVE-2021-20656 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-20656

CVE-2021-20656 is a medium-severity vulnerability in Contec Sv-cpt-mc310 Firmware with a CVSS 3.x base score of 4.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Contec Sv-cpt-mc310 Firmware
Published: 2021-02-24
Last modified: 2026-06-17

Description

Exposure of information through directory listing in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an authenticated attacker to obtain the information inside the system, such as directories and/or file configurations via unspecified vectors.

Frequently asked questions

What is CVE-2021-20656?: Exposure of information through directory listing in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an authenticated attacker to obtain the information inside the system, such as directories and/or file configurations via unspecified vectors.
How severe is CVE-2021-20656?: CVE-2021-20656 has a CVSS 3.x base score of 4.3, 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 none, and availability none.
Is CVE-2021-20656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20656?: CVE-2021-20656 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20656 published?: CVE-2021-20656 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-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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