Hewlett Packard Enterprise (HPE) has issued a security bulletin warning customers of a serious vulnerability in its Telco Service Activator product that could allow attackers to remotely bypass access restrictions.
The vulnerability, identified as CVE-2025-12543, carries a CVSS base score of 9.6 (Critical) and affects versions prior to 10.5.0.
This improper input validation could enable attackers to manipulate the server’s handling of HTTP requests, potentially leading to unauthorized access, exposure of sensitive data, or even partial system compromise.
According to the HPE Product Security Response Team, the issue originates from the Undertow HTTP server core, which fails to validate the Host header in incoming HTTP requests properly.
The vulnerability CVE-2025-12543 affects HPE Telco Service Activator deployments used by telecommunications providers to automate service provisioning across complex network systems.
| CVE ID | CVSS Score | Description | Affected Versions | Patched Version |
|---|---|---|---|---|
| CVE-2025-12543 | 9.6 (Critical) | Improper Host Header Validation in Undertow HTTP Core, leading to access restriction bypass | HPE Telco Service Activator < 10.5.0 | 10.5.0 |
HPE Telco Service Activator Vulnerability
Given the platform’s central role in managing service workflows, exploitation could have significant operational and security implications for network operators.
HPE described the vulnerability as a remote access restriction bypass vulnerability, meaning an unauthenticated attacker could craft malicious HTTP requests to bypass access controls implemented on the server.
The attack does not require prior authorization or deep technical privileges, making it especially dangerous in exposed environments.
The attack vector is classified as Network (AV: N) with Low attack complexity (AC:L) and No privileges required (PR:N), but user interaction required (UI:R), suggesting that successful exploitation might depend on a victim accessing or interacting with a crafted resource.
The vulnerability’s high confidentiality and integrity impact (C:H/I:H) further highlight the severity of potential data exposure or alteration resulting from exploitation.
HPE has released Telco Service Activator version 10.5.0 as the fixed build addressing CVE-2025-12543.
Users running earlier versions are strongly urged to upgrade immediately to mitigate risk. The company emphasized that organizations should apply third-party security patches and updates in line with their standard patch management policies.
Administrators should review network exposure of HPE Telco Service Activator, restrict access to management interfaces, and apply the latest update from HPE’s official support portal.
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