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The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade openvpn | Aug 30, 2017 | Nov 17, 2013 |
| Debian | — | Upgrade openvpn | Jul 30, 2024 | Nov 18, 2013 |
| Freebsd | — | Upgrade openvpn | Dec 10, 2025 | Mar 31, 2013 |
| Gentoo Linux | — | Upgrade net-misc/openvpn. | Oct 30, 2017 | Nov 17, 2013 |
| Suse | — | Upgrade openvpnUpgrade openvpn-auth-pam-pluginUpgrade openvpn-down-root-plugin | Dec 12, 2013 | Nov 17, 2013 |
| Ubuntu | — | Upgrade openvpn | Nov 8, 2024 | Nov 18, 2013 |
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