How severe is CVE-2020-5204?

CVE-2020-5204 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2020-5204 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5204?

CVE-2020-5204 affects Troglobit Uftpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5204?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-5204 published?

CVE-2020-5204 was published on 2020-01-06 and last updated on 2026-06-17.

CVE-2020-5204

CVE-2020-5204 is a medium-severity vulnerability in Troglobit Uftpd with a CVSS 3.x base score of 6.5. 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-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Troglobit Uftpd
Published: 2020-01-06
Last modified: 2026-06-17

Description

In uftpd before 2.11, there is a buffer overflow vulnerability in handle_PORT in ftpcmd.c that is caused by a buffer that is 16 bytes large being filled via sprintf() with user input based on the format specifier string %d.%d.%d.%d. The 16 byte size is correct for valid IPv4 addresses (len('255.255.255.255') == 16), but the format specifier %d allows more than 3 digits. This has been fixed in version 2.11

Frequently asked questions

What is CVE-2020-5204?: In uftpd before 2.11, there is a buffer overflow vulnerability in handle_PORT in ftpcmd.c that is caused by a buffer that is 16 bytes large being filled via sprintf() with user input based on the format specifier string %d.%d.%d.%d. The 16 byte size is correct for valid IPv4 addresses (len('255.255.255.255') == 16), but the format specifier %d allows more than 3 digits. This has been fixed in version 2.11
How severe is CVE-2020-5204?: CVE-2020-5204 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2020-5204 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5204?: CVE-2020-5204 affects Troglobit Uftpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5204?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-5204 published?: CVE-2020-5204 was published on 2020-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:troglobit:uftpd:*:*:*:*:*:*:*:*

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