Description
wolfSSL before 4.5.0 mishandles TLS 1.3 server data in the WAIT_CERT_CR state, within SanityCheckTls13MsgReceived() in tls13.c. This is an incorrect implementation of the TLS 1.3 client state machine. This allows attackers in a privileged network position to completely impersonate any TLS 1.3 servers, and read or modify potentially sensitive information between clients using the wolfSSL library and these TLS servers.
References (1)
Core 1
Core References
Exploit, Third Party Advisory x_refsource_misc
https://research.nccgroup.com/2020/08/24/technical-advisory-wolfssl-tls-1-3-client-man-in-the-middle-attack/
Scores
CVSS v3
6.8
EPSS
0.0086
EPSS Percentile
53.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Details
CWE
CWE-295
Status
published
Products (1)
wolfssl/wolfssl
< 4.5.0
Published
Aug 24, 2020
Tracked Since
Feb 18, 2026