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CVE-2023-3724— TLS 1.3 client issue handling malicious server when not including a KSE and PSK extension

Quick assessment

Affected
wolfSSL wolfSSL
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 WolfSSL 5.6.2之前版本存在安全漏洞，该漏洞源于TLS 1.3会话存在安全问题，允许窃听者重建会话并秘密访问或干预会话中的消息内容。

CVSS 9.1 · Critical EPSS 0.65% · P50

Possible ATT&CK Techniques 2 AI

T1042 T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2023-3724

Vulnerability Information
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Vulnerability Title
TLS 1.3 client issue handling malicious server when not including a KSE and PSK extension
Source: CVE Program / CVE List V5
Vulnerability Description
If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension) when connecting to a malicious server, a default predictable buffer gets used for the IKM (Input Keying Material) value when generating the session master secret. Using a potentially known IKM value when generating the session master secret key compromises the key generated, allowing an eavesdropper to reconstruct it and potentially allowing access to or meddling with message contents in the session. This issue does not affect client validation of connected servers, nor expose private key information, but could result in an insecure TLS 1.3 session when not controlling both sides of the connection. wolfSSL recommends that TLS 1.3 client side users update the version of wolfSSL used. 
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 WolfSSL 5.6.2之前版本存在安全漏洞，该漏洞源于TLS 1.3会话存在安全问题，允许窃听者重建会话并秘密访问或干预会话中的消息内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 3.14.0 ~ 5.6.0 -

II. Public POCs for CVE-2023-3724

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9639 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2023-3724

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Patches & Fixes for CVE-2023-3724 (1)

Vendor Pages for CVE-2023-3724 (1)

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-20

V. Comments for CVE-2023-3724

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