Security advisory

{
  "id": "cacc3280576602840cacffad8db2db93160d9022a5321f22eed33ca06cb2ff2e",
  "url": "https://osv.dev/vulnerability/CVE-2020-15261",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15261",
    "summary": "On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon users (both students and teachers) usually don't have administrative privileges, this vulnerability is only dangerous in anyway unsafe setups. The problem has been fixed in version 4.4.2. As a workaround, the exploitation of the vulnerability can be prevented by revoking administrative privileges from all potentially untrustworthy users.",
    "evidence": "osv:CVE-2020-15261",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-15261",
      "aliases": [
        "CVE-2020-15261",
        "GHSA-c8cc-x786-hqqp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/veyon/veyon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6b67faa0257aa3b50231d23f268580586d59d2c3"
                },
                {
                  "fixed": "f231ec511b9a09f43f49b2c7bb7c60b8046276b1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:veyon:veyon:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f231ec511b9a09f43f49b2c7bb7c60b8046276b1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.4.1",
            "v4.4.0",
            "v4.3.5",
            "v4.3.4",
            "v4.3.3",
            "v4.3.2",
            "v4.3.1",
            "v4.3.0",
            "v4.99.0",
            "v4.2.4",
            "v4.2.3",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.92",
            "v4.1.91",
            "v4.1.90",
            "v4.1.2",
            "v4.1.1",
            "v4.1.0",
            "v4.0.92",
            "v4.0.91",
            "v4.0.90",
            "v4.0.1",
            "v4.0.0",
            "v3.99.7",
            "v3.99.6",
            "v3.99.5",
            "v3.99.4",
            "v3.99.3",
            "v3.99.2",
            "v3.99.1",
            "v3.99.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15261.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-15261-1e952060",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "272118001296872365787519925518929597588",
                    "275342087029539659717202817469162695245",
                    "163600722140506002111636782884147320458",
                    "118613466315895221819147265198958329498",
                    "160732023610005516958705917526652610159",
                    "24231635469766302601441547201643366241",
                    "256975937652514861376594475042041235699",
                    "258769395570646887833924535121040133852"
                  ]
                },
                "source": "https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1",
                "target": {
                  "file": "plugins/platform/windows/WindowsServiceControl.cpp"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-15261-472fe8e6",
                "digest": {
                  "length": 1219,
                  "function_hash": "290294997321056731839350118888527666391"
                },
                "source": "https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1",
                "target": {
                  "file": "plugins/platform/windows/WindowsServiceControl.cpp",
                  "function": "WindowsServiceControl::install"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:52:00Z"
          }
        }
      ],
      "modified": "2026-10-20T13:52:00.506033618Z",
      "provider": "osv",
      "references": [
        "https://github.com/veyon/veyon/security/advisories/GHSA-c8cc-x786-hqqp",
        "https://github.com/veyon/veyon/issues/657",
        "https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1",
        "https://www.exploit-db.com/exploits/48246",
        "https://www.exploit-db.com/exploits/49925"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15261",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388300,
  "published_at": "2020-10-19T22:15:13.093+00:00"
}