CVE-2010-20121

high-risk
Published 2025-08-21

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.”

Do I need to act?

!
68.6% chance of exploitation in next 30 days
EPSS score — higher than 31% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Easyftp Server Project

References (14)

Exploit https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-a...
Exploit https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exp...
Exploit https://seclists.org/bugtraq/2010/Feb/202
Exploit https://www.exploit-db.com/exploits/11668
Exploit https://www.exploit-db.com/exploits/12312
Exploit https://www.exploit-db.com/exploits/14402
Exploit https://www.exploit-db.com/exploits/16737
Third Party Advisory https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-ove...
Exploit https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exp...
Exploit https://seclists.org/bugtraq/2010/Feb/202
Exploit https://www.exploit-db.com/exploits/11668
Exploit https://www.exploit-db.com/exploits/12312
Exploit https://www.exploit-db.com/exploits/14402
Exploit https://www.exploit-db.com/exploits/16737
56
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 19/34 · Moderate
Exposure 5/34 · Minimal