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OpenVPN 2.3.0 and earlier running in UDP mode are subject to chosen ciphertext injection due to a non-constant-time HMAC comparison functionurl>https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cchnique:

The real issue is in the native † † †  9 †žX(¸p‚ðv8scription> CVE-2012-5112ŒÀ† †  * †žX(€((ment. But when validating user permissions when generating the email, the permissions of the user who edited the bug were taken into account instead o’à† †  * †žX(€(( allowed to see, using the victim's credentials. To be exploitable, the victim must be logged in when visiting the attacker's malicious page.

All™€† † *+¹p†-‚S€((afted file, an attacker could cause a denial of service via application crash, or possibly execute arbitrary code with the privileges of the user invoking theŸ † †  * †žX(€((