{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
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            "events": [
              {
                "introduced": "0"
              },
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                "last_affected": "4.60"
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                "last_affected": "4.60"
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            ]
          },
          {
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                "last_affected": "4.60"
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            ]
          },
          {
            "events": [
              {
                "introduced": "0"
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                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
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              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.60"
              }
            ]
          }
        ]
      }
    }
  ],
  "details": "Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.",
  "id": "CVE-2020-29583",
  "modified": "2026-03-15T13:45:13.322173049Z",
  "published": "2020-12-22T22:15:14.443Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-29583"
    },
    {
      "type": "WEB",
      "url": "http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.zyxel.com/support/CVE-2020-29583.shtml"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.zyxel.com/support/security_advisories.shtml"
    },
    {
      "type": "ADVISORY",
      "url": "https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release"
    },
    {
      "type": "ADVISORY",
      "url": "https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html"
    },
    {
      "type": "EVIDENCE",
      "url": "https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}