How severe is CVE-2024-11477?

CVE-2024-11477 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-2024-11477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-11477?

CVE-2024-11477 affects 7-zip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-11477?

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-2024-11477 have an EU (EUVD) identifier?

Yes. CVE-2024-11477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34129.

When was CVE-2024-11477 published?

CVE-2024-11477 was published on 2024-11-22 and last updated on 2026-06-17.

CVE-2024-11477

CVE-2024-11477 is a high-severity vulnerability in 7-zip with a CVSS 3.x base score of 7.8. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-191.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-34129
Weakness: CWE-191
Affected product: 7-zip
Published: 2024-11-22
Last modified: 2026-06-17

Description

7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the implementation of Zstandard decompression. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-24346.

Frequently asked questions

What is CVE-2024-11477?: 7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the implementation of Zstandard decompression. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-24346.
How severe is CVE-2024-11477?: CVE-2024-11477 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-2024-11477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-11477?: CVE-2024-11477 affects 7-zip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-11477?: 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-2024-11477 have an EU (EUVD) identifier?: Yes. CVE-2024-11477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34129.
When was CVE-2024-11477 published?: CVE-2024-11477 was published on 2024-11-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*

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