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CVE-2023-40477

HighPublished

RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability

Published: May 3, 2024
Updated: Nov 4, 2025
Assigning CNA: zdi
Evidence observed: Aug 5, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.0

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

EPSS probability estimate

11.4%

Moderate · next 30 days

Percentile: 95.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of RARLAB WinRAR. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of recovery volumes. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-21233.

Sources

Winrar-CVE-2023-40477-POCPoC
CVE-2023-40477 PoC by Wild-Pointer

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