# CVE-2021-3139: libtcmu2: 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 che...

CVE-2021-3139 is fixed in 2 products on 1 platform, first by libtcmu2 1.5.2-5ubuntu0.20.04.1, released January 13, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-3139
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0268
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 13, 2021

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libtcmu2 Ubuntu 20.04 LTS (focal) | 1.5.2-5ubuntu0.20.04.1 | [libtcmu2 1.5.2-5ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtcmu2-1.5.2-5ubuntu0.20.04.1.md) | Jan 13, 2021 |
| Linux | tcmu-runner Ubuntu 20.04 LTS (focal) | 1.5.2-5ubuntu0.20.04.1 | [tcmu-runner 1.5.2-5ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tcmu-runner-1.5.2-5ubuntu0.20.04.1.md) | Jan 13, 2021 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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