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Published: 18 January 2022

wolfSSL 5.x before 5.1.1 uses non-random IV values in certain situations. This affects connections (without AEAD) using AES-CBC or DES3 with TLS 1.1 or 1.2 or DTLS 1.1 or 1.2. This occurs because of misplaced memory initialization in BuildMessage in internal.c.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
bionic Needs triage

focal Needs triage

upstream Needs triage

kinetic Ignored
(end of life, was needs-triage)
xenial Needs triage

jammy Needs triage

impish Ignored
(end of life)
lunar Needs triage

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N