CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
Incomplete
2011-03-30 00:00 +00:00
2024-02-29 00:00 +00:00
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Loop with Unreachable Exit Condition ('Infinite Loop')
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
Extended Description
If the loop can be influenced by an attacker, this weakness could allow attackers to consume excessive resources such as CPU or memory.
Informations
Applicable Platforms
Language
Class: Not Language-Specific (Undetermined)Common Consequences
| Scope | Impact | Likelihood |
|---|---|---|
| Availability | DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory), DoS: Amplification Note: An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond. |
Observed Examples
| Reference | Description |
|---|---|
| Chain: an operating system does not properly process malformed Open Shortest Path First (OSPF) Type/Length/Value Identifiers (TLV) (CWE-703), which can cause the process to enter an infinite loop (CWE-835) | |
| A Python machine communication platform did not account for receiving a malformed packet with a null size, causing the receiving function to never update the message buffer and be caught in an infinite loop. | |
| Chain: off-by-one error (CWE-193) leads to infinite loop (CWE-835) using invalid hex-encoded characters. | |
| Chain: self-referential values in recursive definitions lead to infinite loop. | |
| NULL UDP packet is never cleared from a queue, leading to infinite loop. | |
| Chain: web browser crashes due to infinite loop - "bad looping logic [that relies on] floating point math [CWE-1339] to exit the loop [CWE-835]" | |
| Floating point conversion routine cycles back and forth between two different values. | |
| Floating point conversion routine cycles back and forth between two different values. | |
| Chain: improperly clearing a pointer in a linked list leads to infinite loop. | |
| Chain: an integer overflow (CWE-190) in the image size calculation causes an infinite loop (CWE-835) which sequentially allocates buffers without limits (CWE-1325) until the stack is full. | |
| Chain: A denial of service may be caused by an uninitialized variable (CWE-457) allowing an infinite loop (CWE-835) resulting from a connection to an unresponsive server. |
Vulnerability Mapping Notes
Rationale : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.Comments : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
References
REF-62
The Art of Software Security AssessmentMark Dowd, John McDonald, Justin Schuh.
REF-962
Automated Source Code Security Measure (ASCSM)Object Management Group (OMG).
http://www.omg.org/spec/ASCSM/1.0/
Submission
| Name | Organization | Date | Date Release | Version |
|---|---|---|---|---|
| CWE Content Team | MITRE | 1.12 |
Modifications
| Name | Organization | Date | Comment |
|---|---|---|---|
| CWE Content Team | MITRE | updated Common_Consequences, Relationships, Taxonomy_Mappings | |
| CWE Content Team | MITRE | updated Demonstrative_Examples, References, Relationships, Taxonomy_Mappings | |
| CWE Content Team | MITRE | updated Demonstrative_Examples | |
| CWE Content Team | MITRE | updated References, Relationships, Taxonomy_Mappings | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Observed_Examples, Relationships | |
| CWE Content Team | MITRE | updated Observed_Examples | |
| CWE Content Team | MITRE | updated Observed_Examples | |
| CWE Content Team | MITRE | updated Description, Observed_Examples | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Mapping_Notes | |
| CWE Content Team | MITRE | updated Observed_Examples | |
| CWE Content Team | MITRE | updated Demonstrative_Examples |
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