How severe is CVE-2021-31606?

CVE-2021-31606 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-2021-31606 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-2021-31606?

CVE-2021-31606 affects Openvpn-monitor Project Openvpn-monitor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31606?

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-2021-31606 published?

CVE-2021-31606 was published on 2021-09-27 and last updated on 2026-06-17.

CVE-2021-31606

CVE-2021-31606 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-287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
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 Authorization Bypass to disconnect arbitrary clients.

Frequently asked questions

What is CVE-2021-31606?: furlongm openvpn-monitor through 1.1.3 allows Authorization Bypass to disconnect arbitrary clients.
How severe is CVE-2021-31606?: CVE-2021-31606 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-2021-31606 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-2021-31606?: CVE-2021-31606 affects Openvpn-monitor Project Openvpn-monitor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31606?: 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-2021-31606 published?: CVE-2021-31606 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-2021-31605 — High (CVSS 7.5): furlongm openvpn-monitor through 1.1.3 allows %0a command injection via the OpenVPN management interface socket. This…
CVE-2021-31604 — Medium (CVSS 6.5): furlongm openvpn-monitor through 1.1.3 allows CSRF to disconnect an arbitrary client.

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →