GHSA-4XRF-PCXR-RF3C

Vulnerability from github – Published: 2023-10-16 18:30 – Updated: 2025-10-22 00:32
VLAI?
Details

Cisco is aware of active exploitation of a previously unknown vulnerability in the web UI feature of Cisco IOS XE Software when exposed to the internet or to untrusted networks. This vulnerability allows a remote, unauthenticated attacker to create an account on an affected system with privilege level 15 access. The attacker can then use that account to gain control of the affected system.

For steps to close the attack vector for this vulnerability, see the Recommendations section of this advisory 

Cisco will provide updates on the status of this investigation and when a software patch is available.

Severity ?
10.0 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2023-20198"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-420"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-10-16T16:15:10Z",
    "severity": "CRITICAL"
  },
  "details": "Cisco is aware of active exploitation of a previously unknown vulnerability in the web UI feature of Cisco IOS XE Software when exposed to the internet or to untrusted networks. This vulnerability allows a remote, unauthenticated attacker to create an account on an affected system with privilege level 15 access. The attacker can then use that account to gain control of the affected system.\n\n For steps to close the attack vector for this vulnerability, see the Recommendations section of this advisory\u00a0\n\n Cisco will provide updates on the status of this investigation and when a software patch is available.",
  "id": "GHSA-4xrf-pcxr-rf3c",
  "modified": "2025-10-22T00:32:51Z",
  "published": "2023-10-16T18:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-20198"
    },
    {
      "type": "WEB",
      "url": "https://arstechnica.com/security/2023/10/actively-exploited-cisco-0-day-with-maximum-10-severity-gives-full-network-control"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/guidance-addressing-cisco-ios-xe-web-ui-vulnerabilities"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-20198"
    },
    {
      "type": "WEB",
      "url": "https://www.darkreading.com/vulnerabilities-threats/critical-unpatched-cisco-zero-day-bug-active-exploit"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/175674/Cisco-IOX-XE-Unauthenticated-Remote-Code-Execution.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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  • 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.
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  • 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.



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