High severity7.5NVD Advisory· Published Sep 5, 2021· Updated Jun 17, 2026
CVE-2021-40524
CVE-2021-40524
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.)
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Affected products
3Patches
Vulnerability mechanics
References
4- github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4nvdPatchThird Party Advisory
- github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50nvdPatchThird Party Advisory
- github.com/jedisct1/pure-ftpd/pull/158nvdExploitThird Party Advisory
- lists.debian.org/debian-lts-announce/2025/11/msg00003.htmlnvd
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