The February 19, 2026, release of the HPE Telco Service Activator Vulnerability Security Bulletin fixes a remote vulnerability in the program that could allow attackers to get around access controls This article explores according hpe vulnerability. . HPE claims that the product's Undertow HTTP server core is the source of the problem.

Find out more Solutions for cloud security Platforms for threat intelligence Email services that are secure The server incorrectly validates the Host header in incoming HTTP requests due to an incorrect input validation condition. The Host header is used by many applications and gateways in real-world deployments to apply security rules, route requests, and enforce allowlists.

Product Component Vulnerability Type Attack CVE ID CVSS Versions CVE-2025-12543 9.6 (Critical) HPE Telco Service Activator Undertow HTTP Server (core) Affected by Vector Impact Incorrect Remote Host Header Validation (HTTP request) Unauthorized access and circumvention of access restrictions Versions before 10.5.0 An attacker may be able to get around intended restrictions by abusing that header to access functionality that host-based controls are supposed to block. HPE assigns a base score of CVSS v3.1 and a vector of to CVE-2025-12543. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L. Remote reachability without authentication is indicated by the "Network" vector and "No privileges required."

However, "user interaction required" implies that the victim may need to do something in order to be exploited, like clicking on a malicious link or initiating a particular request path through a browser or client workflow.

Find out more Software for data security Training in security awareness Solutions for data security Customers using HPE Telco Service Activator versions older than the current one are affected. According to HPE, the vulnerability is fixed by updating to Telco Service Activator. Upgrading TSA should be a top priority for teams, particularly in cases where untrusted networks can access the interface.

Step of Mitigation Limit Exposure Recommendation Limit access to admin networks or VPNs only until patching is finished. Reverse-Proxy Mechanisms On reverse proxies, enforce stringent host allowlists. Log Monitoring Check application and web logs for unexpected routing behavior and unusual host header values. For daily cybersecurity updates, check LinkedIn and X.

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