CVE-2021-3139: Tcmu-Runner Project Tcmu-Runner

High severity, CVSS 8.1. EPSS: 2.7% chance of exploitation in the next 30 days.

In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy_locate_udev in tcmur_cmd_handler.c lacks a check for transport-layer restrictions, allowing remote attackers to read or write files via directory traversal in an XCOPY request. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. NOTE: relative to CVE-2020-28374, this is a similar mistake in a different algorithm.

Affected products

• Tcmu-Runner Project Tcmu-Runner: from 1.3.0, up to and including 1.5.2

Published 2021-01-13. Last modified 2026-06-17.