{"id":"CVE-2021-40524","details":"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.)","modified":"2026-08-18T15:02:05.497859Z","published":"2021-09-05T19:15:15.080Z","related":["openSUSE-SU-2024:11773-1"],"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/11/msg00003.html"},{"type":"FIX","url":"https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4"},{"type":"FIX","url":"https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50"},{"type":"EVIDENCE","url":"https://github.com/jedisct1/pure-ftpd/pull/158"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jedisct1/pure-ftpd","events":[{"introduced":"0"},{"fixed":"868f0e2277e3f5890ca08c84d41de8065a7d8bc3"},{"fixed":"37ad222868e52271905b94afea4fc780d83294b4"}],"database_specific":{"cpe":"cpe:2.3:a:pureftpd:pure-ftpd:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.0.23"},{"fixed":"1.0.50"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["1.0.49","1.0.48","1.0.45","1.0.44","1.0.43","1.0.41","1.0.40","1.0.39","1.0.38","1.0.37","1.0.36","1.0.35","1.0.34","1.0.33"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-40524.json","vanir_signatures_modified":"2026-08-18T15:02:05Z","vanir_signatures":[{"id":"CVE-2021-40524-00e4d04c","signature_type":"Line","signature_version":"v1","source":"https://github.com/jedisct1/pure-ftpd/commit/868f0e2277e3f5890ca08c84d41de8065a7d8bc3","target":{"file":"src/simpleconf_ftpd.h"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["62861421324718626283205813091113225033","276556215880805753523756337752274567287","139825961526930270406704652117385392827"]}},{"deprecated":false,"digest":{"line_hashes":["143088216645301880473965997968294163065","268607288337989793077162423436249802443","280366719401112403696117270706084821257","25497428101258363206954973861780601325","122625483517188019176324232254541051564"],"threshold":0.9},"id":"CVE-2021-40524-178db787","signature_type":"Line","signature_version":"v1","source":"https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4","target":{"file":"src/ftpd.c"}},{"deprecated":false,"digest":{"function_hash":"310052781692296683813829170466513134176","length":5664},"id":"CVE-2021-40524-1865d9b9","signature_type":"Function","signature_version":"v1","source":"https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4","target":{"file":"src/ftpd.c","function":"dostor"}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}