CVE-2021-3139

Name: CVE-2021-3139
Creator: NVD / NIST
Published: 2021-01-13T16:15:14.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 2.65%

Last modified Jun 17, 2026

CVE-2021-3139 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 2.65% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

2.65%

83.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Tcmu-Runner Project	Tcmu-Runner	>= 1.3.0, <= 1.5.2

References

http://www.openwall.com/lists/oss-security/2021/01/13/5Mailing List, Mitigation, Third Party Advisory
https://bugzilla.suse.com/attachment.cgi?id=844938Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1178372Issue Tracking, Third Party Advisory
https://github.com/open-iscsi/tcmu-runner/pull/644Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/01/12/12Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/01/13/5Mailing List, Mitigation, Third Party Advisory
https://bugzilla.suse.com/attachment.cgi?id=844938Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1178372Issue Tracking, Third Party Advisory
https://github.com/open-iscsi/tcmu-runner/pull/644Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/01/12/12Mailing List, Third Party Advisory

Timeline

Published: Jan 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3139?

How severe is CVE-2021-3139?

CVE-2021-3139 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 2.65% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3139?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3139?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST