Description

An authentication vulnerability exists in the AOS-CX management interface and API that may allow improper authentication processing. An unauthenticated remote attacker could exploit this vulnerability under specific conditions to bypass authentication controls or exhaust system resources. Successful exploitation could result in unauthorized access or denial of service affecting the management interface.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-09-01T21:18:43.830Z",
  "pubdate": "2026-09-01T21:18:43.830Z",
  "executiveSummary": "A critical authentication bypass vulnerability has been identified within the AOS-CX management interface and its associated API architecture.\nThe vulnerability stems from improper validation and processing of authentication requests, allowing an unauthenticated remote adversary to circumvent security controls.\nThe risk profile is significant as it potentially grants unauthorized access to administrative functions or facilitates a denial-of-service condition through resource exhaustion.\nExploitation requires no prior authentication, lowering the barrier to entry for attackers targeting the management plane.\nImpact includes a complete compromise of the management interface, potentially leading to unauthorized configuration changes, credential theft, or loss of device availability.\nAffected systems consist of devices running AOS-CX; the flaw specifically resides in the handling of API and management interface session establishment.\nSecurity teams must prioritize mitigating this flaw to prevent unauthorized access and maintain the integrity of the network control plane.",
  "technicalDetails": "The vulnerability exists within the AOS-CX management interface and API, specifically concerning the logic governing authentication request handling.\nThe root cause is identified as an improper authentication process that fails to correctly validate the integrity or the legitimacy of incoming authentication packets before processing requests or allocating system resources.\nWhen an unauthenticated remote attacker interacts with the management interface or API, the device may process crafted requests in a manner that bypasses the intended authentication challenge-response handshake.\nThe attack flow commences with the attacker identifying the target management endpoint, followed by the transmission of specifically crafted payloads designed to exploit the logic flaw in the authentication module.\nIf the request is processed, the system may incorrectly authorize the attacker, granting access to the management interface without valid credentials, or alternatively, the malformed requests may trigger a state of resource contention leading to a denial-of-service condition.\nBecause the vulnerability exists at the management interface level, the affected components are the web-based GUI and the RESTful API endpoints exposed by the AOS-CX software.\nNetwork exposure is defined by the availability of the management interface to the network segment; systems with exposed management interfaces are at the highest risk, as the exploitation does not require the attacker to have established a valid session beforehand.\nIn scenarios involving resource exhaustion, the payload forces the authentication component to perform computationally expensive operations or maintain excessive half-open connections, effectively starving the management process of CPU or memory, thereby preventing legitimate administrators from accessing the interface.\nPost-exploitation, an attacker achieving unauthorized access can manipulate the system configuration, extract sensitive device information, or perform further lateral movement within the network infrastructure.\nThe flaw highlights a failure in the state machine of the authentication provider, where the expected transition from 'unauthenticated' to 'authenticated' can be manipulated by an external agent without satisfying the necessary security parameters."
}