Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when the Java AJP connector and mod_jk load balancing are used, allows remote attackers to cause a denial of service (application outage) via a crafted request with invalid headers, related to temporary blocking of connectors that have encountered errors, as demonstrated by an error involving a malformed HTTP Host header.
CVE-2009-0033 is a security vulnerability that . Impacting 1 product from apache 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.
2009-06-05T16:00:00.187
2026-04-23T00:35:47.467
Modified
CVSSv2: 5.0 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | apache | tomcat | 4.1.0 | Yes |
| Application | apache | tomcat | 4.1.1 | Yes |
| Application | apache | tomcat | 4.1.2 | Yes |
| Application | apache | tomcat | 4.1.3 | Yes |
| Application | apache | tomcat | 4.1.3 | Yes |
| Application | apache | tomcat | 4.1.4 | Yes |
| Application | apache | tomcat | 4.1.5 | Yes |
| Application | apache | tomcat | 4.1.6 | Yes |
| Application | apache | tomcat | 4.1.7 | Yes |
| Application | apache | tomcat | 4.1.8 | Yes |
| Application | apache | tomcat | 4.1.9 | Yes |
| Application | apache | tomcat | 4.1.9 | Yes |
| Application | apache | tomcat | 4.1.10 | Yes |
| Application | apache | tomcat | 4.1.11 | Yes |
| Application | apache | tomcat | 4.1.12 | Yes |
| Application | apache | tomcat | 4.1.13 | Yes |
| Application | apache | tomcat | 4.1.14 | Yes |
| Application | apache | tomcat | 4.1.15 | Yes |
| Application | apache | tomcat | 4.1.16 | Yes |
| Application | apache | tomcat | 4.1.17 | Yes |
| Application | apache | tomcat | 4.1.18 | Yes |
| Application | apache | tomcat | 4.1.19 | Yes |
| Application | apache | tomcat | 4.1.20 | Yes |
| Application | apache | tomcat | 4.1.21 | Yes |
| Application | apache | tomcat | 4.1.22 | Yes |
| Application | apache | tomcat | 4.1.23 | Yes |
| Application | apache | tomcat | 4.1.24 | Yes |
| Application | apache | tomcat | 4.1.25 | Yes |
| Application | apache | tomcat | 4.1.26 | Yes |
| Application | apache | tomcat | 4.1.27 | Yes |
| Application | apache | tomcat | 4.1.28 | Yes |
| Application | apache | tomcat | 4.1.29 | Yes |
| Application | apache | tomcat | 4.1.30 | Yes |
| Application | apache | tomcat | 4.1.31 | Yes |
| Application | apache | tomcat | 4.1.32 | Yes |
| Application | apache | tomcat | 4.1.33 | Yes |
| Application | apache | tomcat | 4.1.34 | Yes |
| Application | apache | tomcat | 4.1.35 | Yes |
| Application | apache | tomcat | 4.1.36 | Yes |
| Application | apache | tomcat | 4.1.37 | Yes |
| Application | apache | tomcat | 4.1.38 | Yes |
| Application | apache | tomcat | 4.1.39 | Yes |
| Application | apache | tomcat | 5.5.0 | Yes |
| Application | apache | tomcat | 5.5.1 | Yes |
| Application | apache | tomcat | 5.5.2 | Yes |
| Application | apache | tomcat | 5.5.3 | Yes |
| Application | apache | tomcat | 5.5.4 | Yes |
| Application | apache | tomcat | 5.5.5 | Yes |
| Application | apache | tomcat | 5.5.6 | Yes |
| Application | apache | tomcat | 5.5.7 | Yes |
| Application | apache | tomcat | 5.5.8 | Yes |
| Application | apache | tomcat | 5.5.9 | Yes |
| Application | apache | tomcat | 5.5.10 | Yes |
| Application | apache | tomcat | 5.5.11 | Yes |
| Application | apache | tomcat | 5.5.12 | Yes |
| Application | apache | tomcat | 5.5.13 | Yes |
| Application | apache | tomcat | 5.5.14 | Yes |
| Application | apache | tomcat | 5.5.15 | Yes |
| Application | apache | tomcat | 5.5.16 | Yes |
| Application | apache | tomcat | 5.5.17 | Yes |
| Application | apache | tomcat | 5.5.18 | Yes |
| Application | apache | tomcat | 5.5.19 | Yes |
| Application | apache | tomcat | 5.5.20 | Yes |
| Application | apache | tomcat | 5.5.21 | Yes |
| Application | apache | tomcat | 5.5.22 | Yes |
| Application | apache | tomcat | 5.5.23 | Yes |
| Application | apache | tomcat | 5.5.24 | Yes |
| Application | apache | tomcat | 5.5.25 | Yes |
| Application | apache | tomcat | 5.5.26 | Yes |
| Application | apache | tomcat | 5.5.27 | Yes |
| Application | apache | tomcat | 6.0.0 | Yes |
| Application | apache | tomcat | 6.0.1 | Yes |
| Application | apache | tomcat | 6.0.2 | Yes |
| Application | apache | tomcat | 6.0.3 | Yes |
| Application | apache | tomcat | 6.0.4 | Yes |
| Application | apache | tomcat | 6.0.5 | Yes |
| Application | apache | tomcat | 6.0.6 | Yes |
| Application | apache | tomcat | 6.0.7 | Yes |
| Application | apache | tomcat | 6.0.8 | Yes |
| Application | apache | tomcat | 6.0.9 | Yes |
| Application | apache | tomcat | 6.0.10 | Yes |
| Application | apache | tomcat | 6.0.11 | Yes |
| Application | apache | tomcat | 6.0.12 | Yes |
| Application | apache | tomcat | 6.0.13 | Yes |
| Application | apache | tomcat | 6.0.14 | Yes |
| Application | apache | tomcat | 6.0.15 | Yes |
| Application | apache | tomcat | 6.0.16 | 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 apache'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.