CVE-2021-40524

HIGH NUCLEI

Pure-FTPd <1.0.50 - DoS

Title source: llm

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.)

Nuclei Templates (1)

Pure-FTPd 1.0.23 < 1.0.50 - Arbitrary File Upload

HIGHVERIFIEDby pussycat0x

Shodan: product:"pure-ftpd" version:"1.0.45" || cpe:"cpe:2.3:a:pureftpd:pure-ftpd"

References (4)

[Exploit, Third Party Advisory] https://github.com/jedisct1/pure-ftpd/pull/158

[Patch, Third Party Advisory] https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50

[Patch, Third Party Advisory] https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4

View Patch ZIP pw:eip

[Mailing List] https://lists.debian.org/debian-lts-announce/2025/11/msg00003.html

Scores

CVSS v3 7.5

EPSS 0.3019

EPSS Percentile 96.7%

Attack Vector NETWORK

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

Details

CWE

CWE-434

Status published

Products (1)

pureftpd/pure-ftpd 1.0.23 - 1.0.50

Published Sep 05, 2021

Tracked Since Feb 18, 2026