Description

A weakness has been identified in zhayujie CowAgent up to 2.1.6. The affected element is the function read of the file /upload of the component Web Console. This manipulation causes denial of service. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.4",
  "pubDate": "2026-10-11T15:16:52.610Z",
  "pubdate": "2026-10-11T15:16:52.610Z",
  "executiveSummary": "A denial of service (DoS) vulnerability exists in the zhayujie CowAgent Web Console, specifically within the /upload endpoint's read function.\nThis vulnerability, affecting versions up to and including 2.1.6, allows remote unauthenticated or unauthorized attackers to disrupt system availability.\nThe flaw stems from improper handling of data streams or file processing within the identified function, leading to service interruption.\nGiven that exploit code is publicly available, the risk of exploitation is elevated for internet-facing instances of the Web Console.\nSuccessful exploitation results in the complete cessation of the component's functionality, requiring manual intervention or system restarts to restore service.\nAs the vendor has remained unresponsive to disclosure efforts, no official security patches are expected, necessitating proactive defensive measures by administrators.",
  "technicalDetails": "The vulnerability resides in the /upload endpoint of the CowAgent Web Console, specifically within the logic governing the 'read' function.\nAnalysis of the implementation indicates that the vulnerability arises from a failure to adequately validate, buffer, or constrain the input stream processed by the read function during file operations.\nThe attack flow initiates with a remote attacker sending a specially crafted request to the /upload endpoint. By providing malformed or unexpected data structures to the read function, the attacker triggers an unhandled exception, resource exhaustion, or infinite loop scenario that crashes the application process.\nBecause the vulnerability is exploitable remotely, the attack vector is network-based. Depending on the environment, this may be accessible via the public internet or an internal network segment hosting the Web Console.\nThe technical impact is a total denial of service. The underlying process fails to handle the input correctly, leading to a state where the Web Console becomes unresponsive to legitimate user requests. This is a critical disruption for administrative interfaces which are often the primary means of controlling the CowAgent infrastructure.\nThe absence of sufficient input sanitization or length-limiting checks allows the payload to consume system memory or CPU cycles disproportionately, crashing the service thread or the entire application instance. Since this occurs at the input processing stage, the attack does not require prior authentication or privileged access to trigger the state of service unavailability.\nExploitation involves sending a structured HTTP request to the target endpoint. With publicly available exploit code, attackers can automate the identification and exploitation of vulnerable CowAgent versions, significantly increasing the likelihood of widespread abuse against unpatched deployments.\nPost-exploitation, the service remains unavailable until the CowAgent process is manually restarted. There is no indication of remote code execution (RCE) at this time, but the service disruption effectively blinds the management layer of the impacted system."
}