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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-17469

An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-17469
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 04:28 UTC · Revision 1

Source evidence

CVE-2020-17469

core-osv · Original source

Published 11 Dec 2020, 23:15 UTC

An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.

osv:CVE-2020-17469
Complete source record
{
  "id": "5b67555488b15c9c097595c3e6c9ca3814e29958c4503b105ef09838022c79eb",
  "url": "https://osv.dev/vulnerability/CVE-2020-17469",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-17469",
    "summary": "An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.",
    "evidence": "osv:CVE-2020-17469",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-17469",
      "aliases": [
        "CVE-2020-17469"
      ],
      "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/butok/fnet",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "fdfcc63a5715b524ab1809fa67e9b939b5510325"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:butok:fnet:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.6.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.6.4",
            "v4.6.3",
            "v4.6.2",
            "v4.6.1",
            "v4.6.0",
            "v4.5.3",
            "v4.5.2",
            "v4.5.1",
            "v4.5.0",
            "v4.4.1",
            "v4.4.0",
            "v4.3.0",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.9.4",
            "v3.9.3updated",
            "v3.9.3prev",
            "v3.9.3pre",
            "v3.9.3",
            "v3.9.2",
            "v3.9.1",
            "v3.9.0",
            "v3.8.2",
            "v3.8.1",
            "v3.8.0",
            "v3.7.0",
            "v3.6.1",
            "3.6.0",
            "v3.5.0",
            "v3.4.0",
            "FNET_3.3.0",
            "v3.2.0",
            "3.1.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-17469.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.867717157Z",
      "provider": "osv",
      "references": [
        "https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01",
        "https://www.kb.cert.org/vuls/id/815128"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-17469",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429877,
  "published_at": "2020-12-11T23:15:13.683+00:00"
}