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CVE-2021-31606

25
FAUCET Score

CVE-2021-31606 describes an authorization bypass vulnerability in furlongm openvpn-monitor versions up to and including 1.1.3, allowing an attacker to disconnect arbitrary OpenVPN clients. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low complexity and no user interaction, leading to a high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.3CPE matchmatch criteria
cpe:2.3:a:openvpn-monitor_project:openvpn-monitor:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.53%
Probability of exploitation in next 30 days
EPSS Percentile
83.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0253 is in the 70th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-5w5c-3g26-8mmchigh

furlongm openvpn-monitor allows Authorization Bypass to disconnect arbitrary clients

May 24, 2022

References

packetstormsecurity.com / files/164274/OpenVPN-Monitor-1.1.3-Authorization-Bypass-Denial-Of-Service.html
Third Party AdvisoryVDB Entry
github.com / furlongm/openvpn-monitor/commit/ddb9d31ef0ec56f578bdacf99ebe9d68455ed8ca
Patch
github.com / furlongm/openvpn-monitor/releases
Third Party Advisory