How severe is CVE-2021-31605?

CVE-2021-31605 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-31605 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31605?

CVE-2021-31605 affects Openvpn-monitor Project Openvpn-monitor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31605?

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-2021-31605 published?

CVE-2021-31605 was published on 2021-09-27 and last updated on 2026-06-17.

CVE-2021-31605

CVE-2021-31605 is a high-severity vulnerability in Openvpn-monitor Project Openvpn-monitor with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Openvpn-monitor Project Openvpn-monitor
Published: 2021-09-27
Last modified: 2026-06-17

Description

furlongm openvpn-monitor through 1.1.3 allows %0a command injection via the OpenVPN management interface socket. This can shut down the server via signal%20SIGTERM.

Frequently asked questions

What is CVE-2021-31605?: furlongm openvpn-monitor through 1.1.3 allows %0a command injection via the OpenVPN management interface socket. This can shut down the server via signal%20SIGTERM.
How severe is CVE-2021-31605?: CVE-2021-31605 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-31605 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31605?: CVE-2021-31605 affects Openvpn-monitor Project Openvpn-monitor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31605?: 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-2021-31605 published?: CVE-2021-31605 was published on 2021-09-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openvpn-monitor_project:openvpn-monitor:*:*:*:*:*:*:*:*

More vulnerabilities in Openvpn-monitor Project Openvpn-monitor

CVE-2021-31606 — High (CVSS 7.5): furlongm openvpn-monitor through 1.1.3 allows Authorization Bypass to disconnect arbitrary clients.
CVE-2021-31604 — Medium (CVSS 6.5): furlongm openvpn-monitor through 1.1.3 allows CSRF to disconnect an arbitrary client.

All CVEs affecting Openvpn-monitor Project Openvpn-monitor →

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