CVE-2023-6936— Heap-buffer over-read with WOLFSSL_CALLBACKS
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2023-6936
Vulnerability Information
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Vulnerability Title
Heap-buffer over-read with WOLFSSL_CALLBACKS
Source: CVE Program / CVE List V5
Vulnerability Description
In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 安全漏洞
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 5.6.6之前版本存在安全漏洞，该漏洞源于如果启用了回调函数，则攻击者可以触发5字节的缓冲区越界读取。
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
II. Public POCs for CVE-2023-6936
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2023-6936 (1)
Vendor Pages for CVE-2023-6936 (1)
IV. Related Vulnerabilities
Same product: wolfSSL
- CVE-2026-7511
PKCS7_verify signer confusion allows forged signatures to be - CVE-2026-7532
iPAddress name constraints not enforced when WOLFSSL_IP_ALT_ - CVE-2026-8720
HMAC-BLAKE2 final discards message when key length exceeds b - CVE-2026-10098
OCSP CertID serial-number length-confusion in wolfSSL_OCSP_r - CVE-2026-11703
Missing SNI/ALPN binding on stateful (session-ID) TLS sessio
Same vendor: wolfSSL
- CVE-2026-7511
PKCS7_verify signer confusion allows forged signatures to be - CVE-2026-7532
iPAddress name constraints not enforced when WOLFSSL_IP_ALT_ - CVE-2026-8720
HMAC-BLAKE2 final discards message when key length exceeds b - CVE-2026-10098
OCSP CertID serial-number length-confusion in wolfSSL_OCSP_r - CVE-2026-11703
Missing SNI/ALPN binding on stateful (session-ID) TLS sessio
V. Comments for CVE-2023-6936
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