CWE-166 (Improper Handling of Missing Special Element) documents a weakness type used across vulnerability databases and security assessments. Use the sections below for definition, context, and mapped CVEs.
The product receives input from an upstream component, but it does not handle or incorrectly handles when an expected special element is missing.
| Kind | Name | Class | Prevalence | OS / CPE |
|---|---|---|---|---|
| language | — | Not Language-Specific | Undetermined | — |
These CVEs are mapped to this weakness in this database and kept for traceability and search.
| CVE | Published | Summary |
|---|---|---|
| CVE-2026-32792 | 2026-05-20 | NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unboun… |
| CVE-2026-21218 | 2026-02-10 | Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network. |
| CVE-2024-38091 | 2024-07-09 | Microsoft WS-Discovery Denial of Service Vulnerability |
| Date | Name | Version | Importance | Comment |
|---|---|---|---|---|
| 2008-07-01 | Eric Dalci | 1.0 | — | updated Potential_Mitigations, Time_of_Introduction |
| 2008-09-08 | CWE Content Team | 1.0 | — | updated Relationships, Other_Notes, Taxonomy_Mappings |
| 2009-03-10 | CWE Content Team | 1.3 | — | updated Relationships |
| 2009-05-27 | CWE Content Team | 1.4 | — | updated Description, Name |
| 2009-07-27 | CWE Content Team | 1.5 | — | updated Potential_Mitigations |
| 2009-10-29 | CWE Content Team | 1.6 | — | updated Other_Notes |
| 2011-03-29 | CWE Content Team | 1.12 | — | updated Potential_Mitigations |
| 2011-06-01 | CWE Content Team | 1.13 | — | updated Common_Consequences |
| 2012-05-11 | CWE Content Team | 2.2 | — | updated Relationships |
| 2012-10-30 | CWE Content Team | 2.3 | — | updated Potential_Mitigations |
| 2014-07-30 | CWE Content Team | 2.8 | — | updated Relationships |
| 2017-05-03 | CWE Content Team | 2.11 | — | updated Potential_Mitigations |
| 2017-11-08 | CWE Content Team | 3.0 | — | updated Applicable_Platforms |
| 2020-02-24 | CWE Content Team | 4.0 | — | updated Potential_Mitigations, Relationships |
| 2020-06-25 | CWE Content Team | 4.1 | — | updated Potential_Mitigations |
| 2023-01-31 | CWE Content Team | 4.10 | — | updated Description, Potential_Mitigations |
| 2023-04-27 | CWE Content Team | 4.11 | — | updated Relationships |
| 2023-06-29 | CWE Content Team | 4.12 | — | updated Mapping_Notes |
| 2024-02-29 | CWE Content Team | 4.14 | — | updated Relationships |
| 2025-12-11 | CWE Content Team | 4.19 | — | updated Weakness_Ordinalities |