CVE-2023-40477: RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability
Reference page built from the source records below, each shown as its source publishes it. Dataset version ref-6bdd89cbc156, updated 2026-06-17T06:18:03.020Z.
NVD analysis
- Status
- Modified
- Published
- 2024-05-03T03:15:20.473
- Last modified
- 2026-06-17T06:18:03.020
- Weaknesses
- CWE-129
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.
| Metric | Score | Severity | Vector | Scored by |
|---|---|---|---|---|
| CVSS 3.0 | 7.8 | HIGH | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | [email protected] (Secondary) |
References
- https://www.win-rar.com/singlenewsview.html?&L=0&tx_ttnews%5Btt_news%5D=232&cHash=c5bf79590657e32554c6683296a8e8aa (Release Notes)
- https://www.zerodayinitiative.com/advisories/ZDI-23-1152/ (Third Party Advisory, VDB Entry)
- 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 (Release Notes)
- https://www.zerodayinitiative.com/advisories/ZDI-23-1152/ (Third Party Advisory, VDB Entry)
This product uses the NVD API but is not endorsed or certified by the NVD.
Read on 2026-11-03T01:44:47.633Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2023-40477
CVE record
- Title (CNA)
- RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability
- Assigner
- zdi
- State
- PUBLISHED
- Published
- 2024-05-03T02:11:12.905Z
- Updated
- 2025-11-04T19:20:10.675Z
- Problem types
- CWE-129: Improper Validation of Array Index
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.
References
Read on 2026-11-03T02:04:23.316Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/40xxx/CVE-2023-40477.json
Detection rules (SigmaHQ)
SigmaHQ rules whose own tags name this CVE. Each rule page shows the rule as its author published it.
- CVE-2023-40477 Potential Exploitation - .REV File Creation (status test, level low)
- CVE-2023-40477 Potential Exploitation - WinRAR Application Crash (status test, level medium)
Defensive techniques (MITRE D3FEND)
D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.
CWE-129: Improper Validation of Array Index
- Restore: Restore Software (acts on Software)
- Harden: Variable Initialization (acts on Subroutine)
- Harden: Credential Scrubbing (acts on Subroutine)
- Harden: Trusted Library (acts on Subroutine)
- Model: Asset Vulnerability Enumeration (acts on Software)
- Model: Software Inventory (acts on Software)
- Isolate: Application-based Process Isolation (acts on Subroutine)
- Harden: Domain Logic Validation (acts on Subroutine)
- Harden: Software Update (acts on Software)
D3FEND ontology version 1.6.0.
Read on 2026-11-02T23:54:49.987Z under licence d3fend-terms-of-use@f98cbc7e from https://d3fend.mitre.org/api/weakness/cwe/CWE-129.json
MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
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Sources and licences
National Vulnerability Database (NIST)
This product uses the NVD API but is not endorsed or certified by the NVD.
NVD API Terms of Use (NIST publications in the public domain, 17 U.S.C. 105)
CVE Program, The MITRE Corporation
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SigmaHQ
"CVE-2023-40477 Potential Exploitation - .REV File Creation" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-40477/file_event_win_exploit_cve_2023_40477_winrar_rev_file_abuse.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-LicenseSigmaHQ
"CVE-2023-40477 Potential Exploitation - WinRAR Application Crash" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-40477/win_application_exploit_cve_2023_40477_winrar_crash.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-LicenseMITRE D3FEND
MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/MITRE D3FEND Terms of Use (site + knowledge graph); source repo MIT
Cite this page
Dragons Eye Ransomware Tracker, "CVE-2023-40477: RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability",
entity page, dataset version ref-6bdd89cbc156, updated 2026-06-17T06:18:03.020Z,
https://ransomware-tracker.com/cve/CVE-2023-40477 (accessed 2026-11-03).
Underlying source: National Vulnerability Database (NIST), CVE API 2.0, record last modified 2026-06-17T06:18:03.020.
Underlying source: CVE List (CVE Program, The MITRE Corporation), record updated 2025-11-04T19:20:10.675Z.
Underlying source: SigmaHQ rule c3bd6c55-d495-4c34-918e-e03e8828c074, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.
Underlying source: SigmaHQ rule e5a29b54-6fe7-4258-8a23-82960e31231a, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.
Underlying source: MITRE D3FEND, ontology version 1.6.0.
Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.