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CVE-2020-24613

MEDIUM
6.8
CVSS Score
Published: August 24, 2020 at 09:06 PM UTC
Updated: June 17, 2026 at 03:05 AM UTC
1 product affected across 1 vendorwolfSSL

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.9%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

wolfSSL· Wolfssl
95%
v < 4.5.0
Affected range stops below 4.5.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://research.nccgroup.com/2020/08/24/technical-advisory-wolfssl-tls-1-3-client-man-in-the-middle-attack/

CVSS

6.8MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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