How severe is CVE-2021-20661?

CVE-2021-20661 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-20661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20661?

CVE-2021-20661 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20661?

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-2021-20661 published?

CVE-2021-20661 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-20661

CVE-2021-20661 is a high-severity vulnerability in Contec Sv-cpt-mc310 Firmware with a CVSS 3.x base score of 8.1. 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-22.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Contec Sv-cpt-mc310 Firmware
Published: 2021-02-24
Last modified: 2026-06-17

Description

Directory traversal vulnerability in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows authenticated attackers to delete arbitrary files and/or directories on the server via unspecified vectors.

Frequently asked questions

What is CVE-2021-20661?: Directory traversal vulnerability in SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows authenticated attackers to delete arbitrary files and/or directories on the server via unspecified vectors.
How severe is CVE-2021-20661?: CVE-2021-20661 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-20661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20661?: CVE-2021-20661 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20661?: 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-2021-20661 published?: CVE-2021-20661 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:*:*:*:*:*:*:*:*

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