CVE-2010-20121Public exploitNetwork attack vector

Unauthenticated code execution via oversized CWD argument

Published Aug 21, 2025 · Updated May 15, 2026

Stack-based buffer overflow in KMiNT21 Software EasyFTP Server 1.7.0.11 and earlier allows remote attackers to execute code via CWD. The FTP command handler accepts an oversized CWD argument into a 264-byte stack buffer without enforcing its length, permitting return-address overwrite. Anonymous FTP access is enabled by default, so valid credentials are normally unnecessary and successful exploitation grants code execution in the server process.

CVSS severity9.3
Critical
EPSS probability3.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in KMiNT21 Software EasyFTP Server 1.7.0.11 and earlier allows remote attackers to execute code via CWD. The FTP command handler accepts an oversized CWD argument into a 264-byte stack buffer without enforcing its length, permitting return-address overwrite. Anonymous FTP access is enabled by default, so valid credentials are normally unnecessary and successful exploitation grants code execution in the server process.

The record

CVE
CVE-2010-20121
Published
Aug 21, 2025
Updated
May 15, 2026
Vendor
KMiNT21 Software
Product
EasyFTP Server
Classifications
CWE-121, CAPEC-100, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.7.0.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KMiNT21 Software · EasyFTP Serverversion=0 <=1.7.0.11

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CAPEC-100Overflow Buffers
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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