CVE-2024-5991— Buffer overread in domain name matching
Quick assessment
Affected
wolfSSL wolfSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在安全漏洞，该漏洞源于 MatchDomainName 函数中，没有对用户输入进行校验。
Possible ATT&CK Techniques 1 AI
T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2024-5991
Vulnerability Information
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Vulnerability Title
Buffer overread in domain name matching
Source: CVE Program / CVE List V5
Vulnerability Description
In function MatchDomainName(), input param str is treated as a NULL terminated string despite being user provided and unchecked. Specifically, the function X509_check_host() takes in a pointer and length to check against, with no requirements that it be NULL terminated. If a caller was attempting to do a name check on a non-NULL terminated buffer, the code would read beyond the bounds of the input array until it found a NULL terminator.This issue affects wolfSSL: through 5.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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存在安全漏洞，该漏洞源于 MatchDomainName 函数中，没有对用户输入进行校验。
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-2024-5991
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Other References for CVE-2024-5991 (1)
Same Patch Batch · wolfSSL · 2024-08-27 · 3 CVEs total
| CVE-2024-1544 | 4.1 MEDIUM | ECDSA nonce bias caused by truncation |
| CVE-2024-5814 | Unverifed Ciphersuite used on a client-side TLS1.3 Downgrade |
IV. Related Vulnerabilities
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CVE-2026-15442
Heap use-after-free on read during bidirectional (D)TLS shut -
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CVE-2026-89135
Failed X509_verify_cert leaves unverified CA in shared CertM
Same vendor: wolfSSL
-
CVE-2026-15442
Heap use-after-free on read during bidirectional (D)TLS shut -
CVE-2026-89102
OCSP stapling v2 multi accepts non-CA chain certificates as -
CVE-2026-89133
NameConstraints not enforced across unconstrained intermedia -
CVE-2026-89134
Subject CN name-constraint check bypassed when non-DNS SAN p -
CVE-2026-89135
Failed X509_verify_cert leaves unverified CA in shared CertM
Same weakness: CWE-125
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V. Comments for CVE-2024-5991
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