A stack-based buffer overflow exists in HPE NonStop TELSERV that corrupts memory and can cause the service to crash or become unresponsive, resulting in a denial‑of‑service. The flaw is classified as CWE‑121, indicating unsafe stack operations without proper bounds checking.

The vulnerability affects HPE NonStop TELSERV. No specific product versions are listed in the advisory, so all current releases of the software may be impacted until HPE releases a fix.

The CVSS v3 base score of 7.5 places this issue in the high‑severity range. The EPSS score is not available, and there is no record in the CISA KEV catalog, suggesting no publicly known exploits at this time. The attack vector is not explicitly stated in the advisory; therefore, the exact level of accessibility required (local, remote, network) is unknown, but the outcome—a service halt—can severely disrupt operations if exploitation succeeds.