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 the verify-x509-name option in a client configuration.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 the verify-x509-name option in a client configuration.
- CVSS 3.1
- 7.4 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 1.24% probability · 68th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-305, CWE-295
- Affected
- openvpn/openvpn
- Source
- security@openvpn.net
References
- https://community.openvpn.net/openvpn/wiki/CVE-2021-3547Patch, Vendor Advisory
- https://community.openvpn.net/openvpn/wiki/SecurityAnnouncementsVendor Advisory
- https://community.openvpn.net/openvpn/wiki/CVE-2021-3547Patch, Vendor Advisory
- https://community.openvpn.net/openvpn/wiki/SecurityAnnouncementsVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.