CVE-2010-20121

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

4.63% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 91.6% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-16.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-08-21 20:10Z1 YR AGO

Last updated

2026-05-15 11:13Z5 MO AGO

Reserved

2025-08-20

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-121Stack-based Buffer OverflowVariant

Data version

5.2

Document digest

2cb5df47f1f9c73259297d1993a3c7ad8b3bcf8fa721dc33873ab5062b0a8eef

• seclists.orghttps://seclists.org/bugtraq/2010/Feb/202third-party-advisoryexploit
• raw.githubusercontent.comhttps://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbexploit
• paulmakowski.wordpress.comhttps://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/technical-descriptionexploit
• www.exploit-db.comhttps://www.exploit-db.com/exploits/12312exploit
• www.exploit-db.comhttps://www.exploit-db.com/exploits/16737exploit
• www.exploit-db.comhttps://www.exploit-db.com/exploits/11668exploit
• www.exploit-db.comhttps://www.exploit-db.com/exploits/14402exploit
• www.vulncheck.comhttps://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflowthird-party-advisory