August 24, 2023 · Applied Cybernetics Group
CVE-2023-38831 — RARLAB WinRAR
known ransomware use
RARLAB WinRAR Code Execution Vulnerability
- Added to KEV
2023-08-24- Federal due date
2023-09-14- Vendor
- RARLAB
- Product
- WinRAR
- EPSS
- 99.9th percentile (score 0.978, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1005 , T1041 , T1053 , T1059.004 , T1105 , T1112 , T1204 , T1486 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-38831
CISA short description
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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.