Security advisory

{
  "id": "366e7a20af929be74cfe57189e9a01d73fc66bc75a533fefab84faf3bd2a298e",
  "url": "https://osv.dev/vulnerability/CVE-2020-28194",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-28194",
    "summary": "Variable underflow exists in accel-ppp radius/packet.c when receiving a RADIUS vendor-specific attribute with length field is less than 2. It has an impact only when the attacker controls the RADIUS server, which can lead to arbitrary code execution.",
    "evidence": "osv:CVE-2020-28194",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-28194",
      "aliases": [
        "CVE-2020-28194",
        "GHSA-2m44-rh3c-x4gr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/accel-ppp/accel-ppp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e9d369aa0054312b7633e964e9f7eb323f1f3d69"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "e9d369aa0054312b7633e964e9f7eb323f1f3d69"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.12.0",
            "1.10.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-28194.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-28194-28ac3858",
                "digest": {
                  "length": 3593,
                  "function_hash": "218305480135744760965322474118285676607"
                },
                "source": "https://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69",
                "target": {
                  "file": "accel-pppd/radius/packet.c",
                  "function": "rad_packet_recv"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-28194-2fff89dc",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "53169831652962479236524189091079696734",
                    "193894202797788791053606579230416303418",
                    "56156999255468833464194175077938322916",
                    "108214281405374322627184477935854642973"
                  ]
                },
                "source": "https://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69",
                "target": {
                  "file": "accel-pppd/radius/packet.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:59:08Z"
          }
        }
      ],
      "modified": "2026-10-20T13:59:08.153739034Z",
      "provider": "osv",
      "references": [
        "https://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69",
        "https://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4gr"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:accel-ppp:accel-ppp:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "accel-ppp:accel-ppp",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.12.0-e9d369a"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-28194",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388468,
  "published_at": "2021-02-01T14:15:12.24+00:00"
}