CVE-2021-40524
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...
- Published
- Sep 5, 2021
- Updated
- Nov 4, 2025
- Assigning CNA
- mitre
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 90.9%
- Model date
- Oct 11, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
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.)
Sources
network/cves/2021/CVE-2021-40524.yaml
Nuclei TemplatesDeclared conditions
- network: tcp($.protocol_keys)
- verification: dsl($.matchers[*].type)
Responsible use
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