The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
CVE-2009-3639 is a security vulnerability that . Impacting 1 product from proftpd organizations running these solutions should prioritize assessment and patching.
Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.
2009-10-28T14:30:00.217
2025-04-09T00:30:58.490
Deferred
CVSSv2: 5.8 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:P/A:P
8.6
4.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | proftpd | proftpd | ≤ 1.3.2 | Yes |
| Application | proftpd | proftpd | 1.3.1 | Yes |
| Application | proftpd | proftpd | 1.3.2 | Yes |
| Application | proftpd | proftpd | 1.3.2 | Yes |
| Application | proftpd | proftpd | 1.3.2 | Yes |
| Application | proftpd | proftpd | 1.3.2 | Yes |
| Application | proftpd | proftpd | 1.3.3 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For proftpd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.