How severe is CVE-2020-23639?

CVE-2020-23639 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-2020-23639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23639?

CVE-2020-23639 affects Moxa Vport 461 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23639?

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-2020-23639 published?

CVE-2020-23639 was published on 2020-11-02 and last updated on 2026-06-17.

CVE-2020-23639

CVE-2020-23639 is a critical-severity vulnerability in Moxa Vport 461 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Moxa Vport 461 Firmware
Published: 2020-11-02
Last modified: 2026-06-17

Description

A command injection vulnerability exists in Moxa Inc VPort 461 Series Firmware Version 3.4 or lower that could allow a remote attacker to execute arbitrary commands in Moxa's VPort 461 Series Industrial Video Servers.

Frequently asked questions

What is CVE-2020-23639?: A command injection vulnerability exists in Moxa Inc VPort 461 Series Firmware Version 3.4 or lower that could allow a remote attacker to execute arbitrary commands in Moxa's VPort 461 Series Industrial Video Servers.
How severe is CVE-2020-23639?: CVE-2020-23639 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-2020-23639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23639?: CVE-2020-23639 affects Moxa Vport 461 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23639?: 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-2020-23639 published?: CVE-2020-23639 was published on 2020-11-02 and last updated on 2026-06-17.

References

https://www.moxa.com/en/support/support/security-advisory/vport-461-series-industrial-video-servers-vulnerabilities

Affected products (1)

cpe:2.3:o:moxa:vport_461_firmware:*:*:*:*:*:*:*:*

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