How severe is CVE-2010-20121?

CVE-2010-20121 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2010-20121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-20121?

CVE-2010-20121 affects Easyftp Server Project Easyftp Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2010-20121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2010-20121 have an EU (EUVD) identifier?

Yes. CVE-2010-20121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2010-5310.

When was CVE-2010-20121 published?

CVE-2010-20121 was published on 2025-08-21 and last updated on 2026-06-16.

CVE-2010-20121

CVE-2010-20121 is a critical-severity vulnerability in Easyftp Server Project Easyftp Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2010-5310
Weakness: CWE-121
Affected product: Easyftp Server Project Easyftp Server
Published: 2025-08-21
Last modified: 2026-06-16

Description

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.”

Frequently asked questions

What is 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.”
How severe is CVE-2010-20121?: CVE-2010-20121 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2010-20121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-20121?: CVE-2010-20121 affects Easyftp Server Project Easyftp Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2010-20121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2010-20121 have an EU (EUVD) identifier?: Yes. CVE-2010-20121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2010-5310.
When was CVE-2010-20121 published?: CVE-2010-20121 was published on 2025-08-21 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:easyftp_server_project:easyftp_server:*:*:*:*:*:*:*:*

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