CVE-2026-21830 in BigFix AEX
Summary
by MITRE • 10/28/2026
HCL BigFix AEX product is affected by a vulnerability in the aws-sdk package.. It may cause AWS API requests to be sent to unintended or non‐AWS endpoints.
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Analysis
by VulDB Data Team • 10/28/2026
The HCL BigFix Application Experience (AEX) component relies on the widely used aws-sdk library to facilitate communication with Amazon Web Services infrastructure, specifically for tasks such as telemetry data collection, configuration synchronization, and cloud resource management. A vulnerability within this dependency introduces a critical flaw in how endpoint resolution is handled during API requests. This issue stems from improper validation or sanitization of input parameters that dictate the target service endpoints, allowing an attacker to manipulate the request routing mechanism. Consequently, legitimate AWS API calls intended for secure Amazon servers can be redirected to maliciously controlled third-party domains or non-AWS endpoints.
This misdirection represents a significant security risk as it undermines the integrity and confidentiality of data transmitted between the BigFix AEX agent and its backend services. If an attacker successfully exploits this flaw by injecting crafted input values, they may intercept sensitive telemetry information, system configuration details, or authentication credentials being sent to AWS. The operational impact includes potential unauthorized access to internal network insights, exposure of user activity metrics, and possible manipulation of the update mechanisms if the redirected endpoint serves malicious payloads instead of legitimate service responses. This scenario aligns with CWE-918, which addresses Server-Side Request Forgery (SSRF) vulnerabilities where a web application fetches a remote resource without validating the user-supplied URL, leading to unintended data exposure or internal network probing.
From an offensive security perspective, this vulnerability can be leveraged in conjunction with other attack vectors such as CWE-20 Improper Input Validation if the attacker has any ability to influence configuration parameters within the BigFix environment. In terms of MITRE ATT&CK mapping, this behavior corresponds to techniques involving T1583 Acquire Infrastructure and potentially T1071 Application Layer Protocol for command and control or data exfiltration if the redirected traffic is monitored by an adversary. The redirection allows attackers to establish a covert channel or harvest credentials without triggering standard security alerts associated with direct connections to known malicious IPs, as the requests appear to originate from legitimate AWS SDK behavior until they reach the external endpoint.
Mitigation strategies must focus on immediate patching of the underlying aws-sdk dependency to the latest secure version provided by HCL BigFix vendors. Administrators should verify that all affected agents are updated and monitor network logs for anomalous DNS queries or HTTP connections originating from AEX processes that do not resolve to standard AWS domain names. Implementing strict egress filtering rules at the firewall level can further restrict outbound traffic from these services, ensuring they only communicate with authorized endpoints. Additionally, enabling detailed logging on both the endpoint agents and central management servers will aid in detecting any attempts to exploit this flaw by observing unexpected connection destinations or failed authentication attempts against non-AWS hosts.