CVE-2023-28502

Deeper analysis

Rocket Software UniData versions prior to 8.2.4 build 3003 and UniVerse versions prior to 11.3.5 build 1001 or 12.2.1 build 2002 contain a stack-based buffer overflow in the udadmin service. The flaw, tracked under CWE-120 and CWE-787, carries a CVSS 3.1 score of 9.8 and permits unauthenticated remote code execution.

An attacker with network access to the UniRPC listener can send a crafted request that overflows the buffer, resulting in arbitrary code execution with root privileges on the affected server. No authentication or user interaction is required, and the attack can be performed over the network.

Public references, including Rapid7’s advisory and Packet Storm postings, point to vendor-supplied updates that remediate the issue by correcting the buffer handling in the udadmin component. Administrators are advised to upgrade UniData and UniVerse to the fixed builds listed in the vendor notices.

EPSS for the CVE rose from low values after disclosure to a peak of 0.8060 in December 2025 before receding to the current 0.6792, indicating increased exploitation interest well after the initial publication. Public proof-of-concept material has been available since shortly after the March 2023 disclosure.