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Security advisory

Type: advisorySources: OSVCVE: CVE-2021-34549

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2021-34549
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 06:41 UTC · Revision 1

Source evidence

CVE-2021-34549

core-osv · Original source

Published 29 Jun 2021, 12:15 UTC

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

osv:CVE-2021-34549
Complete source record
{
  "id": "de375cfb8f02d0655bbf84d514e12abb6f4009a37713bdb4677e83a73260d083",
  "url": "https://osv.dev/vulnerability/CVE-2021-34549",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-34549",
    "summary": "An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.",
    "evidence": "osv:CVE-2021-34549",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-34549",
      "aliases": [
        "CVE-2021-34549"
      ],
      "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": "b925cef1e39e98d1b1a329c8945772a2a1c2d1b8"
                },
                {
                  "fixed": "dbe8cd3642013c27b4afd7f26c55c4f1f144008d"
                },
                {
                  "fixed": "d0ed04d50e80fe1c1ef1bf89edebc51581a6039f"
                },
                {
                  "fixed": "62a500dd1d3ad012e12b7bf49fad912c9733107a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.3.5.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.0.0"
                      },
                      {
                        "fixed": "0.4.4.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.5.0"
                      },
                      {
                        "fixed": "0.4.5.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.6.0"
                      },
                      {
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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-2021-34549.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:43.068854239Z",
      "provider": "osv",
      "references": [
        "https://blog.torproject.org/node/2041",
        "https://security.gentoo.org/glsa/202107-25",
        "https://gitlab.torproject.org/tpo/core/tor/-/issues/40391"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-34549",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435534,
  "published_at": "2021-06-29T12:15:08.643+00:00"
}