CVE-2026-48858 (GCVE-0-2026-48858)

Vulnerability from cvelistv5 – Published: 2026-06-10 14:35 – Updated: 2026-07-24 14:16
VLAI
Title
ftp client PASV response IP not validated against control peer, enabling SSRF and FTP bounce attacks
Summary
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 OTP 29.0.2, OTP 28.5.0.2 and OTP 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.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 16:20 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 345 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Affected: 5.10.4 , < 7.0 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 1.0 , < * (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 17.4 , < * (otp)
Affected: be95772ee1fcfe71045ef070130bea7a910b81e3 , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Jonatan Männchen / EEF Jonatan Männchen / EEF Ingela Anderton Andin
Show details on NVD website
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            "value": "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.\n\nThe ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server\u0027s 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\u0027s 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.\n\nThe 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.\n\nThe ftp application is deprecated and scheduled for removal in OTP-30.\n\nThis vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP\u00a017.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP\u00a021.0 and later).\n\nThis issue affects OTP from OTP 17.4 before OTP\u00a029.0.2, OTP\u00a028.5.0.2 and OTP\u00a027.3.4.13, 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."
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            "lang": "es",
            "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) en Erlang/OTP ftp (m\u00f3dulo ftp_internal) permite ataques de rebote FTP y SSRF a trav\u00e9s de una direcci\u00f3n IP de respuesta PASV no validada.\n\nEl gestor PASV ftp_internal:handle_ctrl_result/2 (mode=passive, ipfamily=inet, ftp_extension=false) extrae la direcci\u00f3n IP de la respuesta 227 del servidor y la pasa directamente a gen_tcp:connect/4 sin validarla contra la direcci\u00f3n del par de la conexi\u00f3n de control. Los gestores EPSV adyacentes llaman correctamente a peername(CSock) para derivar la IP de la conexi\u00f3n de control, pero el gestor PASV no lo hace. Un servidor FTP malicioso o comprometido puede redirigir la conexi\u00f3n de datos del cliente a un host y puerto interno arbitrario. En operaciones de lectura (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), los datos del objetivo redirigido se devuelven al llamador. En operaciones de escritura (ftp:send/2,3, ftp:append/2,3), el contenido del archivo se env\u00eda al objetivo redirigido. Esto permite SSRF contra hosts internos, puntos finales de metadatos en la nube y ataques de rebote FTP contra hosts de terceros.\n\nLa ruta vulnerable es la configuraci\u00f3n predeterminada (mode=passive, ipfamily=inet, ftp_extension=false). La secci\u00f3n 3 de RFC 2577 recomienda expl\u00edcitamente validar la IP de respuesta PASV contra el par de la conexi\u00f3n de control.\n\nLa aplicaci\u00f3n ftp est\u00e1 obsoleta y programada para su eliminaci\u00f3n en OTP-30.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 a 6.5, OTP 17.4 a 20.3) y lib/ftp/src/ftp_internal.erl (ftp 1.0 y posteriores, OTP 21.0 y posteriores).\n\nEste problema afecta a OTP desde OTP 17.4 antes de 29.0.2, 28.5.0.2 y 27.3.4.13 correspondiente a inets desde 5.10.4 antes de 7.0 y ftp desde 1.0 antes de 1.2.6, 1.2.4.1 y 1.2.3.1."
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                  "value": "\u003cp\u003eServer-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.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003eftp_internal:handle_ctrl_result/2\u003c/tt\u003e PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server\u0027s 227 response and passes it directly to \u003ctt\u003egen_tcp:connect/4\u003c/tt\u003e without validating it against the control connection peer address. The adjacent EPSV handlers correctly call \u003ctt\u003epeername(CSock)\u003c/tt\u003e to derive the IP from the control connection, but the PASV handler does not. A malicious or compromised FTP server can redirect the client\u0027s data connection to an arbitrary internal host and port. On read operations (\u003ctt\u003eftp:ls/1,2\u003c/tt\u003e, \u003ctt\u003eftp:nlist/1,2\u003c/tt\u003e, \u003ctt\u003eftp:recv/2,3\u003c/tt\u003e), data from the redirected target is returned to the caller. On write operations (\u003ctt\u003eftp:send/2,3\u003c/tt\u003e, \u003ctt\u003eftp:append/2,3\u003c/tt\u003e), 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.\u003c/p\u003e\u003cp\u003eThe 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.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003eftp\u003c/tt\u003e application is deprecated and scheduled for removal in OTP-30.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/inets/src/ftp/ftp_internal.erl\u003c/tt\u003e (inets 5.10.4 through 6.5, OTP\u0026nbsp;17.4 through 20.3) and \u003ctt\u003elib/ftp/src/ftp_internal.erl\u003c/tt\u003e (ftp 1.0 and later, OTP\u0026nbsp;21.0 and later).\u003c/p\u003e\u003cp\u003eThis issue affects OTP from OTP 17.4 before OTP\u0026nbsp;29.0.2, OTP\u0026nbsp;28.5.0.2 and OTP\u0026nbsp;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.\u003c/p\u003e"
                }
              ],
              "value": "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.\n\nThe ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server\u0027s 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\u0027s 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.\n\nThe 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.\n\nThe ftp application is deprecated and scheduled for removal in OTP-30.\n\nThis vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP\u00a017.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP\u00a021.0 and later).\n\nThis issue affects OTP from OTP 17.4 before OTP\u00a029.0.2, OTP\u00a028.5.0.2 and OTP\u00a027.3.4.13, 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."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-664",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-664 Server Side Request Forgery"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "LOW",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "LOW"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-918",
                  "description": "CWE-918 Server-Side Request Forgery (SSRF)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-24T14:16:02.204Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/erlang/otp/security/advisories/GHSA-24cv-hwgr-37fq"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-48858.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-48858"
            },
            {
              "tags": [
                "x_version-scheme"
              ],
              "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/erlang/otp/commit/2691a806231ffd0490a8a9e20500dec0c7e73727"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/erlang/otp/commit/521bcfa24407ee8cb5614823cf905c37ea3aa605"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "ftp client PASV response IP not validated against control peer, enabling SSRF and FTP bounce attacks",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "Pass \u003ctt\u003e{ftp_extension, true}\u003c/tt\u003e to \u003ctt\u003eftp:open/2\u003c/tt\u003e to use EPSV instead of PASV. Alternatively, pass \u003ctt\u003e{mode, active}\u003c/tt\u003e to use active mode, or pass \u003ctt\u003e{ipfamily, inet6}\u003c/tt\u003e to force IPv6, both of which bypass the vulnerable PASV path."
                }
              ],
              "value": "Pass {ftp_extension, true} to ftp:open/2 to use EPSV instead of PASV. Alternatively, pass {mode, active} to use active mode, or pass {ipfamily, inet6} to force IPv6, both of which bypass the vulnerable PASV path."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-48858",
        "datePublished": "2026-06-10T14:35:45.466Z",
        "dateReserved": "2026-05-25T20:44:10.697Z",
        "dateUpdated": "2026-07-24T14:16:02.204Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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