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Security advisory

Type: advisorySources: OSVCVE: CVE-2020-8516

The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-8516
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 05:35 UTC · Revision 1

Source evidence

CVE-2020-8516

core-osv · Original source

Published 2 Feb 2020, 13:15 UTC

The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability

osv:CVE-2020-8516
Complete source record
{
  "id": "1d9bf000ac7733a5f7ffe085b90cb958727071cfb300055fed209379baa27c84",
  "url": "https://osv.dev/vulnerability/CVE-2020-8516",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8516",
    "summary": "The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability",
    "evidence": "osv:CVE-2020-8516",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8516",
      "aliases": [
        "CVE-2020-8516"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/torproject/tor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "de79264c1d697b16ba434d111a39161757d33225"
                },
                {
                  "last_affected": "971a6beff5a5343415371f7183987e1625bc9565"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.4.1.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.2.0"
                      },
                      {
                        "last_affected": "0.4.2.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8516.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:30.878590749Z",
      "provider": "osv",
      "references": [
        "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html",
        "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html",
        "https://security-tracker.debian.org/tracker/CVE-2020-8516",
        "https://trac.torproject.org/projects/tor/ticket/33129",
        "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8516",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432678,
  "published_at": "2020-02-02T13:15:10.903+00:00"
}