CVE-2021-3139

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 2.6%, top 16% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

January 13, 2021

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Sep 15, 2026
Patch available. Sources: github_pr.
generic

oss-security - CVE-2020-28374: Linux SCSI target (LIO) unrestricted copy offload

https://www.openwall.com/lists/oss-security/2021/01/12/12
github_pr Patch Available

tcmur: fail cross-device XCOPY requests

Patch available: open-iscsi/tcmu-runner v1.5.3 (PR #644 merged 2021-01-13)

https://github.com/open-iscsi/tcmu-runner/pull/644
generic

Making sure you're not a bot!

https://bugzilla.suse.com/show_bug.cgi?id=1178372
generic

Making sure you're not a bot!

https://bugzilla.suse.com/attachment.cgi?id=844938
generic

oss-security - Re: CVE-2020-28374: Linux SCSI target (LIO) unrestricted copy offload

http://www.openwall.com/lists/oss-security/2021/01/13/5

Vendor Advisories for CVE-2021-3139(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntutcmu-runner (1.5.2-5ubuntu0.20.10.1) @ groovy2026-05-26ubuntu
redhattcmu-runner-0:1.4.0-3.el7cp2021-05-06redhat
redhattcmu-runner-0:1.5.2-2.el7cp2021-04-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tcmu—1.5.2-6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
tcmu—1.5.2-6—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
tcmu—1.5.2-6—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
tcmu—1.5.2-6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-09-19 15:38 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
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  10. 2026-09-08 21:56 UTCEPSS rescore
  11. 2026-09-07 15:58 UTCEPSS rescore
  12. 2026-09-07 01:17 UTCOSV refresh
  13. 2026-09-06 13:45 UTCEPSS rescore
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  1. 2026-08-25 13:46 UTCEPSS rescore
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  5. 2026-08-20 22:52 UTCEPSS rescore
  6. 2026-08-20 22:52 UTCEPSS rescore
  7. 2026-08-20 11:01 UTCOSV refresh
  8. 2026-08-19 17:01 UTCEPSS rescore
  9. 2026-08-18 13:45 UTCEPSS rescore
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  11. 2026-08-16 14:53 UTCEPSS rescore
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  19. 2026-08-06 13:44 UTCEPSS rescore
  20. 2026-08-05 19:14 UTCEPSS rescore
  21. 2026-08-05 06:10 UTCOSV refresh
  22. 2026-08-04 10:34 UTCEPSS rescore
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  24. 2026-08-02 02:24 UTCEPSS rescore
  25. 2026-08-01 04:13 UTCEPSS rescore
  26. 2026-07-30 16:25 UTCEPSS rescore
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  34. 2026-07-23 02:00 UTCEG score recompute
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  36. 2026-07-22 14:06 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
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  39. 2026-07-20 17:05 UTCEPSS rescore
  40. 2026-07-19 14:29 UTCEPSS rescore
  41. 2026-07-19 04:22 UTCOSV refresh
  42. 2026-07-19 02:27 UTCEPSS rescore
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  49. 2026-07-15 01:58 UTCEPSS rescore
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  68. 2026-07-02 16:57 UTCEPSS rescore
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  70. 2026-07-01 10:48 UTCOSV refresh
  71. 2026-06-30 23:20 UTCEPSS rescore
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  73. 2026-06-29 14:04 UTCEPSS rescore
  74. 2026-06-28 14:05 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-3139?
CVE-2021-3139 is a high vulnerability published on January 13, 2021. In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopylocateudev in tcmurcmdhandler.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…
When was CVE-2021-3139 disclosed?
CVE-2021-3139 was first published in the National Vulnerability Database on January 13, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-3139 actively exploited?
CVE-2021-3139 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.1% of all scored CVEs.
What is the CVSS score of CVE-2021-3139?
CVE-2021-3139 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2021-3139?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3139, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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