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01 Record

CVE-2021-3547

OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in

UnratedPUBLISHEDCNA: OpenVPN
CNA base scoreUnratedNo CNA CVSS vector
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02 Description

OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
1.23% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 68.7% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-07-12 10:35Z5 YR AGO
Last updated
2024-08-03 17:01Z2 YR AGO
Reserved
2021-05-11
Assigning CNA
OpenVPN
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-305Authentication Bypass by Primary WeaknessBase
  • CWE-295Improper Certificate ValidationBase
Data version
5.1
Document digest
e76feb62278a61f6a5158cba13c53407110b4f8e6a005f6e39b790007bb80465

05 Affected products

VendorProductVersionsPlatforms
n/aOpenVPN 3 Core Library3.6 and 3.6.1—

06 References