What is CVE-2023-38831?

CVE-2023-38831 is a high-severity vulnerability in Rarlab Winrar, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.8/10. Published 2023-08-23.

How severe is CVE-2023-38831?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2023-38831 known to be exploited?

Yes. CVE-2023-38831 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-08-24), indicating it is being actively exploited. 167 public proof-of-concept repositories are indexed.

Vulnerability in Rarlab Winrar

CVE-2023-38831

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…

EPSS: 0.978 (99.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Rarlab Winrar
N/a — versions n/a

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-08-24. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-09-14.

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

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, Press/Media Coverage)
cve@mitre.org (Exploit, Third Party Advisory, Press/Media Coverage)
cve@mitre.org (Issue Tracking)
cve@mitre.org (Exploit, VDB Entry, Third Party Advisory)
cve@mitre.org (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-38831?: CVE-2023-38831 is a high-severity vulnerability in Rarlab Winrar, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.8/10. Published 2023-08-23.
How severe is CVE-2023-38831?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2023-38831 known to be exploited?: Yes. CVE-2023-38831 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-08-24), indicating it is being actively exploited. 167 public proof-of-concept repositories are indexed.