CVE-2021-40524 - CVE House
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Status published High CVE-2021-40524

In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in...

Vulnerability Description

In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2020-35359
Pure-FTPd 1.0.48 allows remote attackers to prevent legitimate server use...
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CVE-2019-20176
In Pure-FTPd 1.0.49, a stack exhaustion issue was discovered in...
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CVE-2011-3171
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Affected Vendor

Affected Software

pure-ftpd
Vulnerable Versions:
1.0.23

Timeline

Official Publish: September 5th, 2021
Last Modified: November 4th, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.