How severe is CVE-2023-40477?

CVE-2023-40477 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40477?

CVE-2023-40477 affects Rarlab Winrar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40477?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-40477 have an EU (EUVD) identifier?

Yes. CVE-2023-40477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45048.

When was CVE-2023-40477 published?

CVE-2023-40477 was published on 2024-05-03 and last updated on 2026-06-17.

CVE-2023-40477

CVE-2023-40477 is a high-severity vulnerability in Rarlab Winrar with a CVSS 3.x base score of 7.8. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-129.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-45048
Weakness: CWE-129
Affected product: Rarlab Winrar
Published: 2024-05-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-40477?: 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.
How severe is CVE-2023-40477?: CVE-2023-40477 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40477?: CVE-2023-40477 affects Rarlab Winrar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-40477 have an EU (EUVD) identifier?: Yes. CVE-2023-40477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45048.
When was CVE-2023-40477 published?: CVE-2023-40477 was published on 2024-05-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rarlab:winrar:*:*:*:*:*:*:*:*

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