CVE-2021-40524

HighCVSS 7.5/10Last modified Jun 17, 2026

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.)

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-434

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/pull/158Exploit, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/pull/158Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/11/msg00003.html

Timeline

Published: Sep 5, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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