Arbitrary file upload in Pureftpd Pure-Ftpd
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 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.)
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.043 (91.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/jedisct1/pure-ftpd/pull/158 (Exploit, Third Party Advisory)
- github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 (Patch, Third Party Advisory)
- github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 (Patch, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-40524?
- CVE-2021-40524 is a high-severity vulnerability in Pureftpd Pure-Ftpd, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.5/10. Published 2021-09-05.
- How severe is CVE-2021-40524?
- High severity. CVSS v3 base score is 7.5 out of 10.