sendmail before 8.14.4 does not properly handle a '\0' character in a Common Name (CN) field of an X.509 certificate, which (1) allows man-in-the-middle attackers to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and (2) allows remote attackers to bypass intended access restrictions via a crafted client certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
CVE-2009-4565 is a security vulnerability that . Impacting 1 product from sendmail organizations running these solutions should prioritize assessment and patching.
Documented in 2010, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.
2010-01-04T21:30:00.640
2026-04-23T00:35:47.467
Modified
CVSSv2: 7.5 (HIGH)
AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | sendmail | sendmail | ≤ 8.14.3 | Yes |
| Application | sendmail | sendmail | 2.6 | Yes |
| Application | sendmail | sendmail | 2.6.1 | Yes |
| Application | sendmail | sendmail | 3.0 | Yes |
| Application | sendmail | sendmail | 3.0.1 | Yes |
| Application | sendmail | sendmail | 4.1 | Yes |
| Application | sendmail | sendmail | 4.55 | Yes |
| Application | sendmail | sendmail | 5 | Yes |
| Application | sendmail | sendmail | 5.59 | Yes |
| Application | sendmail | sendmail | 5.61 | Yes |
| Application | sendmail | sendmail | 5.65 | Yes |
| Application | sendmail | sendmail | 8.6.7 | Yes |
| Application | sendmail | sendmail | 8.7.6 | Yes |
| Application | sendmail | sendmail | 8.7.7 | Yes |
| Application | sendmail | sendmail | 8.7.8 | Yes |
| Application | sendmail | sendmail | 8.7.9 | Yes |
| Application | sendmail | sendmail | 8.7.10 | Yes |
| Application | sendmail | sendmail | 8.8.8 | Yes |
| Application | sendmail | sendmail | 8.9.0 | Yes |
| Application | sendmail | sendmail | 8.9.1 | Yes |
| Application | sendmail | sendmail | 8.9.2 | Yes |
| Application | sendmail | sendmail | 8.9.3 | Yes |
| Application | sendmail | sendmail | 8.10 | Yes |
| Application | sendmail | sendmail | 8.10.0 | Yes |
| Application | sendmail | sendmail | 8.10.1 | Yes |
| Application | sendmail | sendmail | 8.10.2 | Yes |
| Application | sendmail | sendmail | 8.11.0 | Yes |
| Application | sendmail | sendmail | 8.11.1 | Yes |
| Application | sendmail | sendmail | 8.11.2 | Yes |
| Application | sendmail | sendmail | 8.11.3 | Yes |
| Application | sendmail | sendmail | 8.11.4 | Yes |
| Application | sendmail | sendmail | 8.11.5 | Yes |
| Application | sendmail | sendmail | 8.11.6 | Yes |
| Application | sendmail | sendmail | 8.11.7 | Yes |
| Application | sendmail | sendmail | 8.12 | Yes |
| Application | sendmail | sendmail | 8.12 | Yes |
| Application | sendmail | sendmail | 8.12 | Yes |
| Application | sendmail | sendmail | 8.12 | Yes |
| Application | sendmail | sendmail | 8.12 | Yes |
| Application | sendmail | sendmail | 8.12.0 | Yes |
| Application | sendmail | sendmail | 8.12.1 | Yes |
| Application | sendmail | sendmail | 8.12.2 | Yes |
| Application | sendmail | sendmail | 8.12.3 | Yes |
| Application | sendmail | sendmail | 8.12.4 | Yes |
| Application | sendmail | sendmail | 8.12.5 | Yes |
| Application | sendmail | sendmail | 8.12.6 | Yes |
| Application | sendmail | sendmail | 8.12.7 | Yes |
| Application | sendmail | sendmail | 8.12.8 | Yes |
| Application | sendmail | sendmail | 8.12.9 | Yes |
| Application | sendmail | sendmail | 8.12.10 | Yes |
| Application | sendmail | sendmail | 8.13.0 | Yes |
| Application | sendmail | sendmail | 8.13.1 | Yes |
| Application | sendmail | sendmail | 8.13.1.2 | Yes |
| Application | sendmail | sendmail | 8.13.2 | Yes |
| Application | sendmail | sendmail | 8.13.3 | Yes |
| Application | sendmail | sendmail | 8.13.4 | Yes |
| Application | sendmail | sendmail | 8.13.5 | Yes |
| Application | sendmail | sendmail | 8.13.6 | Yes |
| Application | sendmail | sendmail | 8.13.7 | Yes |
| Application | sendmail | sendmail | 8.13.8 | Yes |
| Application | sendmail | sendmail | 8.14.1 | Yes |
| Application | sendmail | sendmail | 8.14.2 | 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 sendmail'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.