CVE-2021-40524

Summary

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.)

Affected Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/jedisct1/pure-ftpd/pull/158
• https://github.com/jedisct1/pure-ftpd/compare/1.0.49…1.0.50
• https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4
• https://lists.debian.org/debian-lts-announce/2025/11/msg00003.html

References

• https://github.com/jedisct1/pure-ftpd/pull/158
• https://github.com/jedisct1/pure-ftpd/compare/1.0.49…1.0.50
• https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4

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