How severe is CVE-2020-8634?

CVE-2020-8634 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-8634 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8634?

CVE-2020-8634 primarily affects Wftpserver Wing Ftp Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-8634?

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

When was CVE-2020-8634 published?

CVE-2020-8634 was published on 2020-03-07 and last updated on 2026-06-17.

CVE-2020-8634

CVE-2020-8634 is a high-severity vulnerability in Wftpserver Wing Ftp Server with a CVSS 3.x base score of 7.8. 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-281.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-281
Affected product: Wftpserver Wing Ftp Server
Published: 2020-03-07
Last modified: 2026-06-17

Description

Wing FTP Server v6.2.3 for Linux, macOS, and Solaris sets insecure permissions on files modified within the HTTP file management interface, resulting in files being saved with world-readable and world-writable permissions. If a sensitive system file were edited this way, a low-privilege user may escalate privileges to root.

Frequently asked questions

What is CVE-2020-8634?: Wing FTP Server v6.2.3 for Linux, macOS, and Solaris sets insecure permissions on files modified within the HTTP file management interface, resulting in files being saved with world-readable and world-writable permissions. If a sensitive system file were edited this way, a low-privilege user may escalate privileges to root.
How severe is CVE-2020-8634?: CVE-2020-8634 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-8634 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8634?: CVE-2020-8634 primarily affects Wftpserver Wing Ftp Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-8634?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-8634 published?: CVE-2020-8634 was published on 2020-03-07 and last updated on 2026-06-17.

References

https://www.hooperlabs.xyz/disclosures/cve-2020-8635.php

Affected products (3)

cpe:2.3:a:wftpserver:wing_ftp_server:6.2.3:*:*:*:*:linux:*:*
cpe:2.3:a:wftpserver:wing_ftp_server:6.2.3:*:*:*:*:macos:*:*
cpe:2.3:a:wftpserver:wing_ftp_server:6.2.3:*:*:*:*:solaris:*:*

More vulnerabilities in Wftpserver Wing Ftp Server

CVE-2025-47812 — Critical (CVSS 10.0): In Wing FTP Server before 7.4.4. the user and admin web interfaces mishandle '\0' bytes, ultimately allowing injection…
CVE-2020-37032 — High (CVSS 8.8): Wing FTP Server 6.3.8 contains a remote code execution vulnerability in its Lua-based web console that allows…
CVE-2019-25267 — High (CVSS 7.8): Wing FTP Server 6.0.7 contains an unquoted service path vulnerability that allows local attackers to potentially…
CVE-2020-9470 — High (CVSS 7.8): An issue was discovered in Wing FTP Server 6.2.5 before February 2020. Due to insecure permissions when handling…
CVE-2020-8635 — High (CVSS 7.8): Wing FTP Server v6.2.3 for Linux, macOS, and Solaris sets insecure permissions on installation directories and…
CVE-2026-44403 — High (CVSS 7.2): Wing FTP Server before 8.1.3 contains an authenticated remote code execution vulnerability in the session serialization…

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