CVE-2026-48858
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk13th percentile — higher than 13% of all known CVEs
Summary
A Server-Side Request Forgery (SSRF) vulnerability in the Erlang/OTP ftp_internal module allows FTP bounce attacks and SSRF via an unvalidated PASV response IP address. The PASV handler does not validate the IP address, allowing a malicious FTP server to redirect the client's data connection to an arbitrary internal host and port.
Risk Assessment
This vulnerability may lead to unauthorized access to the organization's internal resources and enable attacks on external servers. In particular, it could result in data leakage or exploitation of internal services.
Recommendation
It is recommended to update to the latest version of Erlang/OTP and validate the IP address in the PASV response according to RFC 2577 guidelines. Additionally, consider disabling or migrating from the ftp application, which is deprecated.
Original NVD description (English source)
Server-Side Request Forgery (SSRF) vulnerability in Erlang/OTP ftp (ftp_internal module) allows FTP bounce attacks and SSRF via an unvalidated PASV response IP address. The ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server's 227 response and passes it directly to gen_tcp:connect/4 without validating it against the control connection peer address. The adjacent EPSV handlers correctly call peername(CSock) to derive the IP from the control connection, but the PASV handler does not. A malicious or compromised FTP server can redirect the client's data connection to an arbitrary internal host and port. On read operations (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), data from the redirected target is returned to the caller. On write operations (ftp:send/2,3, ftp:append/2,3), file content is sent to the redirected target. This enables SSRF against internal hosts, cloud metadata endpoints, and FTP bounce attacks against third-party hosts. The vulnerable path is the default configuration (mode=passive, ipfamily=inet, ftp_extension=false). RFC 2577 section 3 explicitly recommends validating the PASV response IP against the control connection peer. The ftp application is deprecated and scheduled for removal in OTP-30. This vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP 17.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP 21.0 and later). This issue affects OTP from OTP 17.4 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10.4 before 7.0 and ftp from 1.0 before 1.2.6, 1.2.4.1 and 1.2.3.1.