CVE-2025-52657: HCL MyXalytics DOS Vulnerability

CVE-2025-52657 Overview

CVE-2025-52657 affects HCL MyXalytics and stems from missing input length validation. The application accepts user input without restricting the number of characters submitted. An authenticated attacker can supply oversized input that degrades system performance or reduces availability. The weakness is classified as Allocation of Resources Without Limits or Throttling [CWE-770].

The issue is a denial of service condition rather than a code execution or data disclosure flaw. Exploitation requires network access, low privileges, and some user interaction. Confidentiality and integrity are not impacted, but application availability can be reduced.

Critical Impact
An authenticated user can submit unbounded input to HCL MyXalytics, consuming server resources and degrading availability for other users.

Affected Products

HCL MyXalytics (see vendor advisory for affected versions)

Discovery Timeline

2026-09-07 - CVE CVE-2025-52657 published to NVD
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2025-52657

Vulnerability Analysis

CVE-2025-52657 is a resource exhaustion issue in HCL MyXalytics. The application exposes input fields that do not enforce a maximum character length. When an attacker submits very large payloads, the server processes and stores them without throttling. This behavior can consume memory, CPU, or backend storage disproportionate to the request size.

The flaw is categorized under [CWE-770] Allocation of Resources Without Limits or Throttling. Attacks are conducted over the network against an authenticated session. User interaction is required, which limits automated mass exploitation. Impact is limited to availability, with no direct effect on confidentiality or integrity.

Root Cause

The root cause is missing server-side validation on the length of user-supplied input. Applications should enforce reasonable maximum sizes on all incoming fields, both at the input layer and at any downstream processing stage. Without these checks, a single request can cause disproportionate resource use in parsing, serialization, database writes, or logging pipelines.

Attack Vector

An attacker requires a valid low-privileged account and network access to the MyXalytics interface. The attacker interacts with a vulnerable input field and submits an unusually large payload. Repeated submissions can amplify the effect and prolong the degradation window. Because the CVSS vector shows User Interaction Required, exploitation is tied to normal input flows within the application rather than fully automated background triggers.

No public proof of concept, exploit code, or CISA KEV listing is associated with this CVE at publication. Refer to the HCL Software Knowledge Base Article for vendor technical details.

Detection Methods for CVE-2025-52657

Indicators of Compromise

Abnormally large HTTP request bodies or form field values sent to MyXalytics endpoints.
Sudden spikes in memory or CPU utilization on MyXalytics application servers correlated with authenticated user sessions.
Elevated latency or timeouts reported by legitimate MyXalytics users during specific request patterns.

Detection Strategies

Inspect web server and application logs for requests exceeding expected payload sizes for known form fields.
Correlate authenticated user session identifiers with resource-utilization spikes on the application tier.
Alert on repeated large POST or PUT requests originating from a single account within short time windows.

Monitoring Recommendations

Enable request size logging on the reverse proxy or Web Application Firewall (WAF) in front of MyXalytics.
Track application server memory, CPU, and thread pool metrics with alerting on sustained anomalies.
Baseline typical input sizes per endpoint and flag deviations for security review.

How to Mitigate CVE-2025-52657

Immediate Actions Required

Apply the vendor update referenced in the HCL Software Knowledge Base Article.
Restrict MyXalytics access to trusted internal networks or VPN users where feasible.
Review authenticated user accounts and remove or disable unused accounts to reduce the exploitation surface.

Patch Information

HCL has published guidance for this vulnerability in the HCL Software Knowledge Base Article. Administrators should follow the vendor instructions to apply the fixed version or configuration change for their deployment.

Workarounds

Configure a WAF or reverse proxy to enforce maximum request body size and per-field length limits.
Apply rate limiting on authenticated sessions to bound the volume of large payload submissions.
Monitor and terminate sessions that repeatedly submit oversized inputs.

bash

# Example NGINX request size limit in front of MyXalytics
http {
    client_max_body_size 1m;
    client_body_buffer_size 128k;
    limit_req_zone $binary_remote_addr zone=myx:10m rate=10r/s;

    server {
        location / {
            limit_req zone=myx burst=20 nodelay;
            proxy_pass http://myxalytics_backend;
        }
    }
}