VulnerabilityModified
CVE-2021-4234
OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack.
HIGH 7.5EPSS 0.87%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.87%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.87% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-406
- Affected
- openvpn/openvpn access server
- Source
- security@openvpn.net
References
- https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0Release Notes, Vendor Advisory
- https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.