Buffer overflow in Easyftp Server Project
CVE-2010-20121
EasyFTP Server versions up to 1.7.0.11 contain a stack-based buffer overflow vulnerability in the FTP command parser. When processing the CWD (Change Working Directory) command, the server fails to properly validate the length of the input string, allowing attackers to overwrite memory on the stack. This flaw enables remote code execution without authentication, as EasyFTP allows anonymous access by default. The vulnerability was resolved in version 1.7.0.12, after which the product was renamed “UplusFtp.”
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.032 (87.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- seclists.org/bugtraq/2010/Feb/202 (Exploit, Mailing List, Third Party Advisory, exploit, third-party-advisory)
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/w… (Exploit, exploit)
- paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-… (Exploit, technical-description, Third Party Advisory, exploit)
- www.exploit-db.com/exploits/12312 (Exploit, VDB Entry, exploit)
- www.exploit-db.com/exploits/16737 (Exploit, VDB Entry, exploit)
- www.exploit-db.com/exploits/11668 (Exploit, VDB Entry, exploit)
- www.exploit-db.com/exploits/14402 (Exploit, VDB Entry, exploit)
- www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflow (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2010-20121?
- CVE-2010-20121 is a critical-severity vulnerability in Easyftp Server Project, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-08-21.
- How severe is CVE-2010-20121?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2010-20121 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.