Is CVE-2023-38831 in the CISA KEV catalog?

Yes. CVE-2023-38831 is on the CISA Known Exploited Vulnerabilities list, added 2023-08-24, and has known ransomware campaign use.

What is the CVSS severity of CVE-2023-38831?

CVE-2023-38831 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-38831?

CVE-2023-38831 has an EPSS score of 97.80% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-38831?

Upgrade WinRAR to 6.23 or later.

CVE & CISA-KEV Catalog

CVE-2023-38831

HIGHCISA KEVEPSS 100th pctl

7.8

CVSS v3

NVD

Description

RARLAB WinRAR before 6.23 allows attackers to execute arbitrary code when a user attempts to view a benign file within a ZIP archive. The issue occurs because a ZIP archive may include a benign file (such as an ordinary .JPG file) and also a folder that has the same name as the benign file, and the contents of the folder (which may include executable content) are processed during an attempt to access only the benign file. This was exploited in the wild in April through October 2023.

CWE-345 CWE-351

How to fix

Remediation Available

WinRARWindows application

Affected:6.23Fixed in:6.23win.rar GmbH

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

97.80%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

RARLAB WinRAR Code Execution Vulnerability

RARLAB WinRAR contains an unspecified vulnerability that allows an attacker to execute code when a user attempts to view a benign file within a ZIP archive.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2023-09-14

Associated with ransomware campaigns

References

Exploit4

Government Resource1

cisa.gov

Issue Tracking1

news.ycombinator.com

Related Vulnerabilities

Other CWE-345 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-4553	High	8.6	80%	-	Fix
CVE-2016-4554	High	8.6	39%	-	Fix
CVE-2023-35719	Medium	6.8	26%	-	-
CVE-2022-26871	Critical	9.8	20%	KEV	-
CVE-2014-4936	High	9.3	17%	-	-
CVE-2024-5458	Medium	5.3	12%	-	Fix

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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 2025-10-31.