CVE-2025-55276: HCLTech Aftermarket Cloud Disclosure Flaw

CVE-2025-55276 Overview

HCL Aftermarket DPC is affected by an Internal IP Disclosure vulnerability that exposes sensitive network topology information to attackers. This information disclosure flaw allows unauthorized parties to gain insights into the organization's internal network layout, which can be leveraged for reconnaissance and planning subsequent attacks against internal infrastructure.

Critical Impact

Attackers can obtain a clearer map of the organization's network layout through internal IP address disclosure, enabling more targeted and effective subsequent attacks.

Affected Products

• HCL Aftermarket Cloud version 1.0.0
• HCL Aftermarket DPC

Discovery Timeline

• 2026-03-26 - CVE CVE-2025-55276 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2025-55276

Vulnerability Analysis

This vulnerability falls under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The HCL Aftermarket DPC application inadvertently discloses internal IP addresses to external parties, violating the principle of information hiding that should separate internal network details from external visibility.

Internal IP address disclosure vulnerabilities typically occur when applications include diagnostic information, error messages, or response headers that contain private network addressing information. This information should remain confidential as it provides attackers with valuable reconnaissance data about the target organization's infrastructure.

The exposure of internal IP addresses enables attackers to understand the network segmentation, identify potential pivot points, and plan more sophisticated attacks. While this vulnerability alone does not provide direct system access, it significantly reduces the attacker's effort required for network mapping during the reconnaissance phase of an attack.

Root Cause

The root cause of this vulnerability stems from improper handling of sensitive information within the HCL Aftermarket DPC application. The application fails to sanitize or redact internal IP addresses from responses that are accessible to external users. This type of information leakage often occurs in:

• HTTP response headers containing internal server addresses
• Error messages that reveal backend infrastructure details
• Debug information inadvertently exposed in production environments
• Application responses that include internal routing information

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can remotely access the application and extract internal IP address information through normal application interactions. This network-based attack vector with low complexity makes the vulnerability accessible to a wide range of threat actors.

The attack flow typically involves:

1. Attacker sends requests to the publicly accessible HCL Aftermarket DPC application
2. Application responses contain internal IP address information
3. Attacker collects and maps the disclosed IP addresses
4. Gathered information is used to plan further attacks against internal infrastructure

Detection Methods for CVE-2025-55276

Indicators of Compromise

• Unusual volume of requests probing various application endpoints
• Sequential or systematic access patterns indicative of automated reconnaissance
• Requests specifically targeting error-generating conditions to elicit verbose responses
• Access to administrative or diagnostic endpoints from external IP addresses

Detection Strategies

• Monitor HTTP response headers for inadvertent disclosure of RFC 1918 private IP addresses (10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x)
• Implement web application firewall (WAF) rules to detect and alert on internal IP patterns in outbound traffic
• Review application logs for patterns indicating systematic probing of endpoints
• Deploy network monitoring to identify reconnaissance activities targeting the Aftermarket DPC application

Monitoring Recommendations

• Enable comprehensive logging of all requests and responses to the HCL Aftermarket DPC application
• Configure alerts for detection of internal IP address patterns in outbound HTTP responses
• Establish baseline traffic patterns to identify anomalous reconnaissance activities
• Regularly audit application responses and headers for information disclosure issues

How to Mitigate CVE-2025-55276

Immediate Actions Required

• Review and apply the security patch from HCL Software as detailed in the HCL Software Knowledge Base Article
• Audit current application configuration to identify sources of IP address disclosure
• Implement reverse proxy or load balancer configurations to mask internal infrastructure
• Review error handling mechanisms to prevent verbose error messages from reaching external users

Patch Information

HCL Software has released guidance and remediation information for this vulnerability. Organizations running HCL Aftermarket Cloud 1.0.0 should consult the HCL Software Knowledge Base Article for specific patch details and update instructions.

Workarounds

• Deploy a web application firewall (WAF) configured to strip internal IP addresses from outbound responses
• Configure reverse proxies to remove or rewrite headers containing internal network information
• Implement custom error pages that do not expose internal infrastructure details
• Use network address translation (NAT) at the application layer to obscure internal addressing

Configuration recommendations for limiting information disclosure through reverse proxy headers can help mitigate exposure until a permanent patch is applied. Review the vendor advisory for the most up-to-date mitigation guidance.