CWE-430: Deployment of Wrong Handler
The wrong "handler" is assigned to process an object.
Last updated
Overview
An example of deploying the wrong handler would be calling a servlet to reveal source code of a .JSP file, or automatically "determining" type of the object even if it is contradictory to an explicitly specified type.
Real-world CVEs
1 recorded CVEs are caused by CWE-430 (Deployment of Wrong Handler). The highest-severity and most recent are shown first. 0 new CWE-430 CVEs have been recorded so far in 2026 (1 in 2025).
Common consequences
What can happen when CWE-430 is exploited.
Varies by Context, Unexpected State
Affects: Integrity, Other
How it happens
When it is introduced
Typically introduced during these phases of the software lifecycle.
How to prevent it
Practical mitigations for CWE-430, grouped by where in the lifecycle they apply.
Perform a type check before interpreting an object.
Reject any inconsistent types, such as a file with a .GIF extension that appears to consist of PHP code.
Illustrative examples
Real CVEs that MITRE cites as examples of this weakness.
- CVE-2001-0004 — Source code disclosure via manipulated file extension that causes parsing by wrong DLL.
- CVE-2002-0025 — Web browser does not properly handle the Content-Type header field, causing a different application to process the document.
- CVE-2000-1052 — Source code disclosure by directly invoking a servlet.
- CVE-2002-1742 — Arbitrary Perl functions can be loaded by calling a non-existent function that activates a handler.
Terminology & mappings
Mapped taxonomies
- PLOVER: Improper Handler Deployment
Attack patterns
CAPEC attack patterns that exploit this weakness.
Frequently asked questions
Common questions about CWE-430.
- What is CWE-430?
- The wrong "handler" is assigned to process an object.
- What CVEs are caused by CWE-430?
- 1 recorded CVEs are attributed to CWE-430, including CVE-2025-3946.
- How do you prevent CWE-430?
- Perform a type check before interpreting an object.
- What are the consequences of CWE-430?
- Exploiting CWE-430 can lead to: Varies by Context, Unexpected State.
- Is CWE-430 actively exploited?
- 1 recorded CVEs are caused by CWE-430; none are currently in CISA's KEV catalog of actively exploited flaws.
References
- MITRE CWE definition (CWE-430) (opens in a new tab)
- CWE-430 vulnerabilities on NVD (opens in a new tab)
- Learn: What is a CWE?
Weakness data is sourced from the MITRE CWE catalog (v4.20). CVE associations are aggregated and kept current by RadicalNotion.AI.
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