Summary
Server-Side Request Forgery in ftp-srv
All versions of ftp-srv from v1.0.0 onward to v4.3.3 are vulnerable to Server-Side Request Forgery (SSRF). The package fails to prevent remote clients to access other resources in the network, for example when connecting to the server through telnet. This allows attackers to access any network resources available to the server, including private resources in the hosting environment.
Workarounds
Blacklisting the FTP Command PORT will prevent the server from exposing this behaviour through active connections until a fix is applied.
const ftp = new FtpSrv({
blacklist: ['PORT']
});
Impact
Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Upgrade to patched versions^2.19.6, ^3.1.2, ^4.3.4
Frequently Asked Questions
- What is GHSA-R4M5-47CQ-6QG8? GHSA-R4M5-47CQ-6QG8 is a high-severity server-side request forgery (SSRF) vulnerability in ftp-srv (npm), affecting versions >= 1.0.0, < 2.19.6. It is fixed in 2.19.6, 3.1.2, 4.3.4. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
- Which versions of ftp-srv are affected by GHSA-R4M5-47CQ-6QG8? ftp-srv (npm) versions >= 1.0.0, < 2.19.6 is affected.
- Is there a fix for GHSA-R4M5-47CQ-6QG8? Yes. GHSA-R4M5-47CQ-6QG8 is fixed in 2.19.6, 3.1.2, 4.3.4. Upgrade to this version or later.
- Is GHSA-R4M5-47CQ-6QG8 exploitable, and should I be worried? Whether GHSA-R4M5-47CQ-6QG8 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-R4M5-47CQ-6QG8 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-R4M5-47CQ-6QG8?
- Upgrade
ftp-srvto 2.19.6 or later - Upgrade
ftp-srvto 3.1.2 or later - Upgrade
ftp-srvto 4.3.4 or later
- Upgrade