How severe is CVE-2021-20658?

CVE-2021-20658 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20658?

CVE-2021-20658 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20658?

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

When was CVE-2021-20658 published?

CVE-2021-20658 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-20658

CVE-2021-20658 is a critical-severity vulnerability in Contec Sv-cpt-mc310 Firmware with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Contec Sv-cpt-mc310 Firmware
Published: 2021-02-24
Last modified: 2026-06-17

Description

SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an attacker to execute arbitrary OS commands with the web server privilege via unspecified vectors.

Frequently asked questions

What is CVE-2021-20658?: SolarView Compact SV-CPT-MC310 prior to Ver.6.5 allows an attacker to execute arbitrary OS commands with the web server privilege via unspecified vectors.
How severe is CVE-2021-20658?: CVE-2021-20658 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20658?: CVE-2021-20658 affects Contec Sv-cpt-mc310 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20658?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-20658 published?: CVE-2021-20658 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-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…
CVE-2022-35239 — High (CVSS 8.8): The image file management page of SolarView Compact SV-CPT-MC310 Ver.7.23 and earlier, and SV-CPT-MC310F Ver.7.23 and…

All CVEs affecting Contec Sv-cpt-mc310 Firmware →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-56004 — Critical (CVSS 10.0): A shellcode injection in the mercurial handler of the obs tar_scm source service before version 0.12.4 could be used by…
CVE-2026-56415 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability within the debug.pl script that is…
CVE-2026-56413 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability in the ms_service.pl service, which listens…
CVE-2026-49869 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in…
CVE-2026-49261 — Critical (CVSS 10.0): MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through…
CVE-2026-10520 — Critical (CVSS 10.0): An OS Command Injection vulnerability in Ivanti Sentry before the R10.5.2, R10.6.2 and R10.7.1 versions allows a…

Browse all CWE-78 (OS Command Injection) vulnerabilities →