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Security advisory

Type: advisorySources: OSVCVE: CVE-2020-10593

Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2020-004. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-10593
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 08:07 UTC · Revision 1

Source evidence

CVE-2020-10593

core-osv · Original source

Published 23 Mar 2020, 13:15 UTC

Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2020-004. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.

osv:CVE-2020-10593
Complete source record
{
  "id": "d697f67ba3c42ca90e31446c6e1b463475f934b9396248adfbc0a176a13db2e3",
  "url": "https://osv.dev/vulnerability/CVE-2020-10593",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-10593",
    "summary": "Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2020-004. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.",
    "evidence": "osv:CVE-2020-10593",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-10593",
      "aliases": [
        "CVE-2020-10593"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/torproject/tor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "87fca699578e7190c37e68a290d72b4a77c2be40"
                },
                {
                  "fixed": "93ed011a26757b71630e7b61aee947337f6d4b0b"
                },
                {
                  "last_affected": "74cad14699087b7ee0b6b17927a3f64683fe31e9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.3.5"
                      },
                      {
                        "fixed": "0.3.5.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.4.1.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.4.2.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
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          }
        },
        {
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                  },
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                      }
                    ],
                    "source": "CPE_RANGE"
                  }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-10593.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:03.085685144Z",
      "provider": "osv",
      "references": [
        "https://security.gentoo.org/glsa/202003-50",
        "https://trac.torproject.org/projects/tor/ticket/33619"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*"
            ],
            "vendor_product": "opensuse:backports_sle",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.0-sp1"
                  },
                  {
                    "last_affected": "15.0-sp1"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
            ],
            "vendor_product": "opensuse:leap",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.1"
                  },
                  {
                    "last_affected": "15.1"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-10593",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440166,
  "published_at": "2020-03-23T13:15:13.033+00:00"
}