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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-35217

Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.

Products
Not specified
Affected versions
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Fixed versions
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CVEs
CVE-2020-35217
Confirmed fixed CVEs
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Updated in this feed
31 Oct 2026, 11:12 UTC · Revision 1

Source evidence

CVE-2020-35217

core-osv · Original source

Published 20 Jan 2021, 13:15 UTC

Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.

osv:CVE-2020-35217
Complete source record
{
  "id": "48e7c38569bade5c605c229b5c95fca72bb07f2699e06c51563b25b99372d325",
  "url": "https://osv.dev/vulnerability/CVE-2020-35217",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-35217",
    "summary": "Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.",
    "evidence": "osv:CVE-2020-35217",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-35217",
      "aliases": [
        "CVE-2020-35217",
        "GHSA-9q69-g5gc-9fgf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vert-x3/vertx-web",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1d18809825e4280ab2e5302d6409783bea04f3b3"
                },
                {
                  "last_affected": "1d0a62d5d571d45b2b6165b083d0da90b9207481"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:eclipse:vert.x-web:4.0.0:milestone1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0-milestone1"
                      },
                      {
                        "last_affected": "4.0.0-milestone1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:eclipse:vert.x-web:4.0.0:milestone2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0-milestone2"
                      },
                      {
                        "last_affected": "4.0.0-milestone2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:eclipse:vert.x-web:4.0.0:milestone3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0-milestone3"
                      },
                      {
                        "last_affected": "4.0.0-milestone3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:eclipse:vert.x-web:4.0.0:milestone4:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0-milestone4"
                      },
                      {
                        "last_affected": "4.0.0-milestone4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0.0-milestone1",
            "4.0.0-milestone2",
            "4.0.0-milestone3",
            "4.0.0-milestone4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35217.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:18.277368986Z",
      "provider": "osv",
      "references": [
        "https://github.com/vert-x3/vertx-web/pull/1613"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-35217",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384261,
  "published_at": "2021-01-20T13:15:12.44+00:00"
}