CVE-2025-69217 (GCVE-0-2025-69217)

Vulnerability from cvelistv5 – Published: 2025-12-30 00:41 – Updated: 2025-12-30 15:57
VLAI
Title
Coturn has unsafe nonce and relay port randomization due to weak random number generation.
Summary
coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren't generated with openssl's RAND_bytes but libc's random() (if it's not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-30 13:57 UTC
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7664 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
coturn coturn Affected: >= 4.6.2r5, <= 4.7.0-r4
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-69217",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-30T13:57:12.783500Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-30T15:57:25.040Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "coturn",
          "vendor": "coturn",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.6.2r5, \u003c= 4.7.0-r4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren\u0027t generated with openssl\u0027s RAND_bytes but libc\u0027s random() (if it\u0027s not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-338",
              "description": "CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-30T00:41:18.792Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coturn/coturn/security/advisories/GHSA-fvj6-9jhg-9j84",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coturn/coturn/security/advisories/GHSA-fvj6-9jhg-9j84"
        },
        {
          "name": "https://github.com/coturn/coturn/commit/11fc465f4bba70bb0ad8aae17d6c4a63a29917d9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coturn/coturn/commit/11fc465f4bba70bb0ad8aae17d6c4a63a29917d9"
        },
        {
          "name": "https://github.com/coturn/coturn/commit/88ced471385869d7e7fbbc4766e78ef521b36af6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coturn/coturn/commit/88ced471385869d7e7fbbc4766e78ef521b36af6"
        }
      ],
      "source": {
        "advisory": "GHSA-fvj6-9jhg-9j84",
        "discovery": "UNKNOWN"
      },
      "title": "Coturn has unsafe nonce and relay port randomization due to weak random number generation."
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-69217",
    "datePublished": "2025-12-30T00:41:18.792Z",
    "dateReserved": "2025-12-29T15:03:15.428Z",
    "dateUpdated": "2025-12-30T15:57:25.040Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-69217",
      "date": "2026-10-22",
      "epss": "0.00412",
      "percentile": "0.34332"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "coturn",
                "vendor": "coturn",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 4.6.2r5, \u003c= 4.7.0-r4"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren\u0027t generated with openssl\u0027s RAND_bytes but libc\u0027s random() (if it\u0027s not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix."
          },
          {
            "lang": "es",
            "value": "coturn es una implementaci\u00f3n de c\u00f3digo abierto gratuita de servidor TURN y STUN. Las versiones 4.6.2r5 a 4.7.0-r4 tienen un generador de n\u00fameros aleatorios deficiente para nonces y la aleatorizaci\u00f3n de puertos despu\u00e9s de la refactorizaci\u00f3n. Adem\u00e1s, los n\u00fameros aleatorios no se generan con RAND_bytes de OpenSSL sino con random() de libc (si no se ejecuta en Windows). Al obtener aproximadamente 50 nonces secuenciales (es decir, mediante el env\u00edo de 50 solicitudes de asignaci\u00f3n no autenticadas), es posible reconstruir completamente el estado actual del generador de n\u00fameros aleatorios, prediciendo as\u00ed el siguiente nonce. Esto permite la autenticaci\u00f3n mientras se suplantan IPs. Un atacante puede enviar mensajes autenticados sin recibir nunca las respuestas, incluido el nonce (requiere conocimiento de las credenciales, lo cual es, por ejemplo, a menudo el caso en entornos IoT). Dado que la aleatorizaci\u00f3n de puertos es determinista dada la semilla pseudoaleatoria, un atacante puede reconstruir exactamente los puertos y, por lo tanto, predecir la aleatorizaci\u00f3n de los puertos. Si un atacante asigna un puerto de retransmisi\u00f3n, conoce el puerto actual y puede predecir el siguiente puerto de retransmisi\u00f3n (al menos si no se ha utilizado antes). El commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contiene una soluci\u00f3n."
          }
        ],
        "id": "CVE-2025-69217",
        "lastModified": "2026-10-13T08:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.7,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.1,
              "impactScore": 4.0,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2025-69217",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-30T13:57:12.783500Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-12-30T01:15:41.390",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/coturn/coturn/commit/11fc465f4bba70bb0ad8aae17d6c4a63a29917d9"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/coturn/coturn/commit/88ced471385869d7e7fbbc4766e78ef521b36af6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/coturn/coturn/security/advisories/GHSA-fvj6-9jhg-9j84"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-338"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-06-28T07:11:38+00:00",
      "cve": "CVE-2025-69217",
      "id": "CVE-2025-69217",
      "initial_release_date": "2025-12-30T00:41:18.792000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "coturn: coturn: Authentication bypass and port prediction via predictable random number generation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-69217.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-69217",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-12-30T13:57:12.783500Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-12-30T15:55:22.199Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "coturn",
              "vendor": "coturn",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003e= 4.6.2r5, \u003c= 4.7.0-r4"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren\u0027t generated with openssl\u0027s RAND_bytes but libc\u0027s random() (if it\u0027s not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.7,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-338",
                  "description": "CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-30T00:41:18.792Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/coturn/coturn/security/advisories/GHSA-fvj6-9jhg-9j84",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/coturn/coturn/security/advisories/GHSA-fvj6-9jhg-9j84"
            },
            {
              "name": "https://github.com/coturn/coturn/commit/11fc465f4bba70bb0ad8aae17d6c4a63a29917d9",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/coturn/coturn/commit/11fc465f4bba70bb0ad8aae17d6c4a63a29917d9"
            },
            {
              "name": "https://github.com/coturn/coturn/commit/88ced471385869d7e7fbbc4766e78ef521b36af6",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/coturn/coturn/commit/88ced471385869d7e7fbbc4766e78ef521b36af6"
            }
          ],
          "source": {
            "advisory": "GHSA-fvj6-9jhg-9j84",
            "discovery": "UNKNOWN"
          },
          "title": "Coturn has unsafe nonce and relay port randomization due to weak random number generation."
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2025-69217",
        "datePublished": "2025-12-30T00:41:18.792Z",
        "dateReserved": "2025-12-29T15:03:15.428Z",
        "dateUpdated": "2025-12-30T15:57:25.040Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.