What CVEs are caused by CWE-235?

4 recorded CVEs are attributed to CWE-235, including CVE-2017-20160, CVE-2026-27851, CVE-2024-47651.

What are the consequences of CWE-235?

Exploiting CWE-235 can lead to: Unexpected State.

Is CWE-235 actively exploited?

4 recorded CVEs are caused by CWE-235; none are currently in CISA's KEV catalog of actively exploited flaws.

Variant weakness

Draft

CWE-235: Improper Handling of Extra Parameters

The product does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount.

Last updated May 1, 2026

Recorded CVEs

With this primary weakness

KEVs

In the CISA KEV catalog

Not rated

Likelihood of exploit

Per MITRE

Variant

Abstraction

MITRE classification

Overview

CWE-235 (Improper Handling of Extra Parameters) is a variant-level software weakness catalogued by MITRE in the Common Weakness Enumeration (CWE). It describes a recurring type of mistake that can lead to exploitable security vulnerabilities.

Real-world CVEs

4 recorded CVEs are caused by CWE-235 (Improper Handling of Extra Parameters). The highest-severity and most recent are shown first. 2 new CWE-235 CVEs have been recorded so far in 2026.

Common consequences

What can happen when CWE-235 is exploited.

Unexpected State

Affects: Integrity

How it happens

When it is introduced

Typically introduced during these phases of the software lifecycle.

Implementation

Illustrative examples

Real CVEs that MITRE cites as examples of this weakness.

CVE-2003-1014 — MIE. multiple gateway/security products allow restriction bypass using multiple MIME fields with the same name, which are interpreted differently by clients.

Terminology & mappings

Mapped taxonomies

PLOVER: Extra Parameter Error

Attack patterns

CAPEC attack patterns that exploit this weakness.

CAPEC-460: HTTP Parameter Pollution (HPP)

Frequently asked questions

Common questions about CWE-235.

What is CWE-235?: The product does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount.
What CVEs are caused by CWE-235?: 4 recorded CVEs are attributed to CWE-235, including CVE-2017-20160, CVE-2026-27851, CVE-2024-47651.
What are the consequences of CWE-235?: Exploiting CWE-235 can lead to: Unexpected State.
Is CWE-235 actively exploited?: 4 recorded CVEs are caused by CWE-235; none are currently in CISA's KEV catalog of actively exploited flaws.

References

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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