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Fencer Vulns
medium 6.1

CVE-2020-27735 json

An XSS issue was discovered in Wing FTP 6.4.4.

published 2021-01-20 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20239

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.8%
EPSS 5.8% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Exploit prediction

5.76% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Wing FTP 6.4.4 - Cross-Site Scripting nuclei detection template
  • wshenk.blogspot.com https://wshenk.blogspot.com/2021/01/xss-in-wing-ftps-web-interface-cve-2020.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.