Is ftp.gnu.org Safe? Security Score 74.6/100 | CyStack
ftp.gnu.org
Index of /
since 1983, developing the free unix style operating system gnu, so that computer users can have the freedom to share and improve the software they use.
Industry
Computers, Electronics and Technology / Programming and Developer Software
Origin
United States
Global rank
#68,441
Rank in United States
#64,611
Updated at
C74.6/100
Security level
Fair
Data confidence
High
Scope checked
97.3%
The higher the score, the more externally observable protections the system has recorded. This page does not certify that the website is reputable, legitimate, or completely free of vulnerabilities.
Is the website “ftp.gnu.org” safe?
As of September 21, 2026 at 14:22, ftp.gnu.org has a security score of 74.6/100 (grade C: “Fair”). CyStack’s automated assessment recorded 14 issues to review after completing 97.3% of applicable checks. The website owner should address “Known-exploited CVE candidates” first, then review the remaining items in order of impact.
Does ftp.gnu.org show known scam, phishing, or malware signals?
At assessment time, CyStack did not find ftp.gnu.org or related infrastructure on any scam, phishing, or malware warning list after checking 5 online reputation sources. This result reflects external observations; it does not guarantee absolute safety or verify the organization’s legal status or reputation.
Potentially exposed domain email addressesChecks infostealer data for email addresses ending in @gnu.org, the registered domain of the assessed website ftp.gnu.org. A record is not counted merely because someone visited or signed in to the website.7 matching email exposure records
7Matching email exposure records
5Related infected devices (estimated)
These matching email records were observed previously, but they may already have been addressed or may no longer be valid. The device count estimates infected devices associated with these email records; it is not the number of devices owned by the organization.
Frequently asked questions
What affects the security of ftp.gnu.org?
A valid SSL certificate still does not prove that ftp.gnu.org is safe, legitimate, or free of scam signals. For a more complete assessment, this report also checks phishing and malware, exposed email records, IPs and open ports, subdomains, technologies, and CVEs that may apply to observed versions.
Does ftp.gnu.org use HTTPS, and is its SSL certificate valid?
ftp.gnu.org used a valid SSL certificate at assessment time, valid until October 29, 2026. This status may change when the certificate expires or the server configuration changes.
Data compiled from CyStack cybersecurity monitoring systems
CyStack compiles scan results from its internal cybersecurity monitoring systems, including CyStack VulnScan and CyStack Threat Intelligence, together with publicly available Internet data. The assessment only observes and analyzes information already available; it does not attempt unauthorized access, test passwords, send exploit code, or change or disrupt the assessed system.
These 3 failed checks or warnings have the greatest impact on the result for ftp.gnu.org.
Known-exploited CVE candidatesFound 1 known-exploited candidate(s), but the external product fingerprint requires verification.Critical
Why it matters
This check asks whether an applicable CVE candidate also appears in the CISA Known Exploited Vulnerabilities (KEV) catalog. A positive match means attackers have used that vulnerability in real incidents and warrants urgent investigation, but the installed software still needs to be confirmed as affected.
What to do
Verify the installed product immediately and follow the CISA and vendor instructions for mitigation, patching, or upgrading if it is affected.
Evidence and check scope
Known exploited vulnerabilities:
1
Total known-exploited candidates:
1
Possible CVE identifiers:
CVE-2022-22719, CVE-2022-22720, CVE-2022-22721, CVE-2022-23943, CVE-2022-26377, CVE-2022-28615, CVE-2022-29404, CVE-2022-31813, CVE-2022-36760, CVE-2023-25690… and 38 more
Possible CVE identifiers shown:
CVE-2022-22719, CVE-2022-22720, CVE-2022-22721, CVE-2022-23943, CVE-2022-26377, CVE-2022-28615, CVE-2022-29404, CVE-2022-31813, CVE-2022-36760, CVE-2023-25690… and 38 more
Public management service exposureA confirmed public management service was found: 209.51.188.20:22 (ssh).High
Why it matters
Remote administration services such as RDP, VNC, Docker, Kubernetes, and management consoles are high-value targets. Public exposure allows anyone on the Internet to attempt passwords or exploit an unpatched service.
What to do
Remove direct Internet access and require a VPN, a hardened access gateway, or trusted source networks; also use MFA where supported.
File-sharing service exposed to the InternetA confirmed public file-sharing service was found: 209.51.188.20:873 (rsync).High
Why it matters
Services such as SMB, NFS, and rsync can reveal or modify shared files and have a history of serious vulnerabilities. They rarely need to accept connections directly from the public Internet.
What to do
Limit file-sharing services to private networks or a tightly controlled VPN, and allow only the users and systems that require access.
Leak evidenceMost recent observation:
Email addressRelated infected deviceInfection evidenceRecorded time
Email addressD**********@gnu.orgRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-19644751C8Infection evidenceStealCRecorded timeEmail addressS****@gnu.orgRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-19644751C8Infection evidenceStealCEmail addressm*****@gnu.orgRelated infected deviceC********* (Windows 11 Professionnel Insider Preview (10.0.27749) x64)CanadaIOC reference: IOC-7D30FCEC61Infection evidenceEmail addressm*****@gnu.orgRelated infected deviceA*************** (Windows 10 Pro (10.0.19045) x64)IndiaIOC reference: IOC-1FD6A04CA0Infection evidenceEmail addressm*****@gnu.orgRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-F3B02788DFInfection evidenceCS.Stealer.SatanicEmail addressm*****@gnu.orgRelated infected deviceV******* (Windows 11 Pro for Workstations (10.0.22631) x64)ChileIOC reference: IOC-A79FA8B2CFInfection evidence
At most 10 recent redacted records are shown to protect sensitive information.
Data provided by
Discovered subdomains (189+)Subdomains of gnu.org, the registered domain of the assessed website ftp.gnu.org. Sensitive-looking names are shown first; individual subdomains have not been separately security-tested.Partial
Public web contextThe website title, description, industry and popularity.Website rankings and industry category are based on data from Similarweb
Page title
Index of /
Website category
Computers, Electronics and Technology / Programming and Developer Software
Description
since 1983, developing the free unix style operating system gnu, so that computer users can have the freedom to share and improve the software they use.
Global rank
#68,441
Rank in United States
#64,611
Rank in industry
#1,252
Final URL
https://ftp.gnu.org/
This is a quick, point-in-time check from outside the organization. It can surface visible risks, but it does not replace penetration testing or an authenticated assessment.
Have @gnu.org email addresses appeared in exposed data or information-stealer (infostealer) logs?
There are currently 7 exposed email records matching the gnu.org domain. These records may be old or already resolved. The website owner should verify them before resetting passwords or locking related accounts.
Which public IPs, services, and ports does ftp.gnu.org expose?
The assessment observed 2 public IPs and 5 open ports for ftp.gnu.org. An open port is not the same as a vulnerability, but the website owner should keep every public service updated and appropriately restrict access.
How many subdomains of gnu.org have been discovered?
The assessment observed 189+ public subdomains of gnu.org. This list can reveal additional entry points such as APIs, administration systems, or test environments, but it does not mean that every subdomain is risky.
Industry
Updated at 
United States
