GHSA-59JX-M3C4-2M9W

Vulnerability from github – Published: 2022-05-24 17:37 – Updated: 2025-10-22 00:32
VLAI?
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.

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2020-29583"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-312",
      "CWE-522"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-12-22T22:15:00Z",
    "severity": "HIGH"
  },
  "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": "GHSA-59jx-m3c4-2m9w",
  "modified": "2025-10-22T00:32:01Z",
  "published": "2022-05-24T17:37:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29583"
    },
    {
      "type": "WEB",
      "url": "https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release"
    },
    {
      "type": "WEB",
      "url": "https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-29583"
    },
    {
      "type": "WEB",
      "url": "https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html"
    },
    {
      "type": "WEB",
      "url": "https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583"
    },
    {
      "type": "WEB",
      "url": "https://www.zyxel.com/support/CVE-2020-29583.shtml"
    },
    {
      "type": "WEB",
      "url": "https://www.zyxel.com/support/security_advisories.shtml"
    },
    {
      "type": "WEB",
      "url": "http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf"
    },
    {
      "type": "WEB",
      "url": "http://ftp.zyxel.com/USG40/firmware/USG40_4.60(AALA.1)C0_2.pdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.