How severe is CVE-2020-27735?

CVE-2020-27735 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-27735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27735?

CVE-2020-27735 affects Wftpserver Wing Ftp Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27735?

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

When was CVE-2020-27735 published?

CVE-2020-27735 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2020-27735

CVE-2020-27735 is a medium-severity vulnerability in Wftpserver Wing Ftp Server with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Wftpserver Wing Ftp Server
Published: 2021-01-26
Last modified: 2026-06-17

Description

An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.

Frequently asked questions

What is CVE-2020-27735?: An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.
How severe is CVE-2020-27735?: CVE-2020-27735 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-27735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27735?: CVE-2020-27735 affects Wftpserver Wing Ftp Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27735 published?: CVE-2020-27735 was published on 2021-01-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wftpserver:wing_ftp_server:6.4.4:*:*:*:*:*:*:*

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