PatchTheCVECVE-2010-20121: EasyFTP Server versions up to 1.7.0.11 contain a stack-based buffer overflow vulnerability in the FTP command
CVE-2010-20121 is a critical-severity flaw (CVSS 9.8) affecting easyftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 vers
Why this priority
- Critical severity
- EPSS top 8%: very likely to be exploited
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 4.6% (top 8%) |
| CISA exploited list | No |
| Weakness | CWE-121 |
| Published | 2025-08-21 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/
- Write-up: seclists.org/bugtraq/2010/Feb/202
- Write-up: www.exploit-db.com/exploits/11668
- Metasploit: EasyFTP Server CWD Command Stack Buffer Overflow
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2010-20121?
easyftp server: upgrade to 1.7.0.12. Exact commands for each OS are on this page.
Is CVE-2010-20121 being exploited?
CVE-2010-20121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2010-20121 affect?
CVE-2010-20121 affects easyftp server. Severity is critical (CVSS 9.8). 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
How urgent is CVE-2010-20121?
Priority 70/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2010-20113 CRITICAL 9.8 UPGRADE EasyFTP Server 1.7.0.11 and earlier contains a stack-based buffer overflow vulnerability in its HTTP interface