What’s Vulnerable › Vulnerabilities

CVE-2023-40477: RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-03 · updated 2026-06-17
• Weakness: CWE-129

Description

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.

Affected products

• WinRAR: before 6.23 — fixed in 6.23

How to fix

Upgrade to a fixed version: WinRAR 6.23. Check the vendor advisory for mitigations.

References

• https://www.win-rar.com/singlenewsview.html?&L=0&tx_ttnews%5Btt_news%5D=232&cHash=c5bf79590657e32554c6683296a8e8aa
• https://www.zerodayinitiative.com/advisories/ZDI-23-1152/
• https://lists.debian.org/debian-lts-announce/2023/11/msg00009.html
• https://www.win-rar.com/singlenewsview.html?&L=0&tx_ttnews%5Btt_news%5D=232&cHash=c5bf79590657e32554c6683296a8e8aa
• https://www.zerodayinitiative.com/advisories/ZDI-23-1152/

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