Description

Unchecked input for loop condition in .NET allows an unauthorized attacker to deny service over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-11T17:18:44.380Z",
  "pubdate": "2026-08-11T17:18:44.380Z",
  "executiveSummary": "This vulnerability involves an unchecked input flaw within loop conditions in .NET applications, which can be exploited by an unauthorized remote attacker to cause a denial of service (DoS).\nThe core vulnerability stems from the processing of untrusted input directly within loop termination or iteration logic without proper boundary validation or sanitization.\nWhen successfully exploited, this flaw allows threat actors to induce excessive resource consumption, such as CPU exhaustion or infinite loop execution, rendering the affected service unresponsive or entirely unavailable to legitimate users.\nThe affected product is .NET, impacting systems that parse external or network-provided data streams without rigorous input validation before loop evaluation.\nThe risk implications are significant for availability, as the attack can be executed over a network without requiring prior authentication or specialized privileges.\nExploitation requirements are minimal, typically needing only the ability to transmit a maliciously crafted payload to an exposed network endpoint that processes the unvalidated input within a vulnerable loop structure.",
  "technicalDetails": "The vulnerability resides in the internal handling of loop control variables and conditional expressions within .NET runtime or application logic when processing external inputs.\nThe root cause is the absence of adequate bounds checking, length validation, or state verification on incoming data that directly influences the initialization, continuation, or termination criteria of iterative constructs such as for, while, or do-while loops.\nVulnerable components include any network-facing routines, parsers, or data-handling functions within .NET applications where raw network streams or untrusted parameters govern iterative execution flows.\nAttack exposure is network-based, meaning an unauthorized remote attacker can deliver the payload over standard network protocols without needing authentication or elevated privileges.\nThe attack flow begins when an attacker crafts a malicious input payload specifically designed to manipulate the loop's conditional state—for instance, by supplying integer values that bypass standard termination conditions or cause counter variables to overflow or underflow.\nUpon ingestion, the .NET application evaluates this unvalidated input directly within the loop condition.\nThis payload behavior forces the application into an infinite or excessively long iteration cycle, monopolizing CPU threads and exhausting available computational resources.\nAs the affected thread becomes permanently blocked or heavily bogged down processing the invalid loop, the thread pool depletes, preventing the application from servicing concurrent legitimate requests.\nThe post-exploitation impact is strictly confined to a denial of service, manifesting as application latency, thread starvation, service crashes, or complete operational outage, thereby disrupting business continuity."
}