PT-2021-22920 · Pure Ftpd+1 · Pure-Ftpd+1

Droidtest · Published 2021-09-05 · Updated 2025-11-04 · CVE-2021-40524

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Pure-FTPd versions 1.0.23 through 1.0.49

Description The issue arises from an incorrect max filesize quota mechanism in the server, allowing attackers to upload files of unbounded size. This can lead to denial of service or a server hang due to a certain greater-than-zero test not anticipating an initial -1 value.

Recommendations For versions 1.0.23 through 1.0.49, update to version 1.0.50 or later to resolve the issue.

Exploit

Fix

DoS

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2021-40524

DLA-4360-1

OPENSUSE-SU-2024:11773-1

ROSA-SA-2023-2188

Affected Products

Debian

Pure-Ftpd

References · 22

• 🔥 https://github.com/jedisct1/pure-ftpd/pull/158 · Exploit
• https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 · Patch
• https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-40524 · Security Note
• https://ubuntu.com/security/CVE-2021-40524 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-4360-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-40524 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-40524 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-40524 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11773-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-40524 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-40524 · Vendor Advisory
• https://t.me/cvenotify/23809 · Telegram Post
• https://t.me/cvenotify/20673 · Telegram Post
• https://t.me/cibsecurity/28268 · Telegram Post