Auth bypass in Coreftp Core FTP
CVE-2019-25686
Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.
Vulnerability class: Broken Authentication
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: 0.005 (37.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Coreftp Core FTP — versions 2.0
- Coreftp Core FTP — versions 2.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46532 (Exploit, VDB Entry, exploit)
- www.coreftp.com/ (Product, product)
- coreftp.com/server/download/archive/CoreFTPServer653.exe (Product, product)
- www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25686?
- CVE-2019-25686 is a high-severity vulnerability in Coreftp Core FTP, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-04-05.
- How severe is CVE-2019-25686?
- High severity. CVSS v3 base score is 7.5 out of 10.