Is CVE-2018-20834 in the CISA KEV catalog?

No. CVE-2018-20834 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20834?

CVE-2018-20834 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-20834?

CVE-2018-20834 has an EPSS score of 3.15% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20834?

Upgrade node-tar on debian 11 to 4.4.4+ds1-2 or later.

CVE & CISA-KEV Catalog

CVE-2018-20834

HIGHEPSS 86th pctl

7.5

CVSS v3

NVD

Description

A vulnerability was found in node-tar before version 4.4.2 (excluding version 2.2.2). An Arbitrary File Overwrite issue exists when extracting a tarball containing a hardlink to a file that already exists on the system, in conjunction with a later plain file with the same name as the hardlink. This plain file content replaces the existing file content. A patch has been applied to node-tar v2.2.2).

CWE-59Link Following

How to fix

Remediation Available

node-tarDebian

Fixed in:4.4.4+ds1-2CVE-2018-20834

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

3.15%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch2

Exploit1

hackerone.com

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-04.