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CVE-2026-20282 (GCVE-0-2026-20282)

Vulnerability from cvelistv5 – Published: 2026-09-16 20:15 – Updated: 2026-09-16 20:15
VLAI
Title
Cisco Identity Services Engine Authenticated Write Vulnerability
Summary
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.
CWE
  • CWE-641 - Improper Restriction of Names for Files and Other Resources
Impacted products
Vendor Product Version CPE status
Cisco Cisco Identity Services Engine Software Affected: 3.1.0
Affected: 3.1.0 p1
Affected: 3.1.0 p3
Affected: 3.1.0 p2
Affected: 3.2.0
Affected: 3.1.0 p4
Affected: 3.1.0 p5
Affected: 3.2.0 p1
Affected: 3.1.0 p6
Affected: 3.2.0 p2
Affected: 3.1.0 p7
Affected: 3.3.0
Affected: 3.2.0 p3
Affected: 3.2.0 p4
Affected: 3.1.0 p8
Affected: 3.2.0 p5
Affected: 3.2.0 p6
Affected: 3.1.0 p9
Affected: 3.3 Patch 2
Affected: 3.3 Patch 1
Affected: 3.3 Patch 3
Affected: 3.4.0
Affected: 3.2.0 p7
Affected: 3.3 Patch 4
Affected: 3.4 Patch 1
Affected: 3.1.0 p10
Affected: 3.3 Patch 5
Affected: 3.3 Patch 6
Affected: 3.4 Patch 2
Affected: 3.3 Patch 7
Affected: 3.4 Patch 3
Affected: 3.5.0
Affected: 3.4 Patch 4
Affected: 3.3 Patch 8
Affected: 3.2 Patch 8
Affected: 3.5 Patch 1
Affected: 3.3 Patch 9
Affected: 3.2 Patch 9
Affected: 3.4 Patch 5
Affected: 3.5 Patch 3
Affected: 3.5 Patch 2
Affected: 3.3 Patch 10
Affected: 3.3 Patch 11
Affected: 3.4 Patch 6
Affected: 3.2 Patch 10
Affected: 3.1.0 p72
Affected: 3.1.0 p11
Affected: 3.1.0 p12
Affected: 3.2 Patch 11
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco Identity Services Engine Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "3.1.0"
            },
            {
              "status": "affected",
              "version": "3.1.0 p1"
            },
            {
              "status": "affected",
              "version": "3.1.0 p3"
            },
            {
              "status": "affected",
              "version": "3.1.0 p2"
            },
            {
              "status": "affected",
              "version": "3.2.0"
            },
            {
              "status": "affected",
              "version": "3.1.0 p4"
            },
            {
              "status": "affected",
              "version": "3.1.0 p5"
            },
            {
              "status": "affected",
              "version": "3.2.0 p1"
            },
            {
              "status": "affected",
              "version": "3.1.0 p6"
            },
            {
              "status": "affected",
              "version": "3.2.0 p2"
            },
            {
              "status": "affected",
              "version": "3.1.0 p7"
            },
            {
              "status": "affected",
              "version": "3.3.0"
            },
            {
              "status": "affected",
              "version": "3.2.0 p3"
            },
            {
              "status": "affected",
              "version": "3.2.0 p4"
            },
            {
              "status": "affected",
              "version": "3.1.0 p8"
            },
            {
              "status": "affected",
              "version": "3.2.0 p5"
            },
            {
              "status": "affected",
              "version": "3.2.0 p6"
            },
            {
              "status": "affected",
              "version": "3.1.0 p9"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 2"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 1"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 3"
            },
            {
              "status": "affected",
              "version": "3.4.0"
            },
            {
              "status": "affected",
              "version": "3.2.0 p7"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 4"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 1"
            },
            {
              "status": "affected",
              "version": "3.1.0 p10"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 5"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 6"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 2"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 7"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 3"
            },
            {
              "status": "affected",
              "version": "3.5.0"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 4"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 8"
            },
            {
              "status": "affected",
              "version": "3.2 Patch 8"
            },
            {
              "status": "affected",
              "version": "3.5 Patch 1"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 9"
            },
            {
              "status": "affected",
              "version": "3.2 Patch 9"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 5"
            },
            {
              "status": "affected",
              "version": "3.5 Patch 3"
            },
            {
              "status": "affected",
              "version": "3.5 Patch 2"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 10"
            },
            {
              "status": "affected",
              "version": "3.3 Patch 11"
            },
            {
              "status": "affected",
              "version": "3.4 Patch 6"
            },
            {
              "status": "affected",
              "version": "3.2 Patch 10"
            },
            {
              "status": "affected",
              "version": "3.1.0 p72"
            },
            {
              "status": "affected",
              "version": "3.1.0 p11"
            },
            {
              "status": "affected",
              "version": "3.1.0 p12"
            },
            {
              "status": "affected",
              "version": "3.2 Patch 11"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device.\r\n\r\nThis vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system.\r\nTo exploit this vulnerability, the attacker must have valid administrative credentials.\r\nNote: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is aware that a public announcement is available for the vulnerabilities that are described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-641",
              "description": "Improper Restriction of Names for Files and Other Resources",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T20:15:43.378Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-ise-mult-vul-ymSsTLCc",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-mult-vul-ymSsTLCc"
        }
      ],
      "source": {
        "advisory": "cisco-sa-ise-mult-vul-ymSsTLCc",
        "defects": [
          "CSCwu40000"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Identity Services Engine Authenticated Write Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20282",
    "datePublished": "2026-09-16T20:15:43.378Z",
    "dateReserved": "2025-10-08T11:59:15.403Z",
    "dateUpdated": "2026-09-16T20:15:43.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-20282",
      "date": "2026-09-17",
      "epss": "0.00556",
      "percentile": "0.45016"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-20282\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2026-09-16T21:17:08.837\",\"lastModified\":\"2026-09-16T21:17:08.837\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device.\\r\\n\\r\\nThis vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system.\\r\\nTo exploit this vulnerability, the attacker must have valid administrative credentials.\\r\\nNote: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.\"}],\"affected\":[{\"source\":\"psirt@cisco.com\",\"affectedData\":[{\"vendor\":\"Cisco\",\"product\":\"Cisco Identity Services Engine Software\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"3.1.0\",\"status\":\"affected\"},{\"version\":\"3.1.0 p1\",\"status\":\"affected\"},{\"version\":\"3.1.0 p3\",\"status\":\"affected\"},{\"version\":\"3.1.0 p2\",\"status\":\"affected\"},{\"version\":\"3.2.0\",\"status\":\"affected\"},{\"version\":\"3.1.0 p4\",\"status\":\"affected\"},{\"version\":\"3.1.0 p5\",\"status\":\"affected\"},{\"version\":\"3.2.0 p1\",\"status\":\"affected\"},{\"version\":\"3.1.0 p6\",\"status\":\"affected\"},{\"version\":\"3.2.0 p2\",\"status\":\"affected\"},{\"version\":\"3.1.0 p7\",\"status\":\"affected\"},{\"version\":\"3.3.0\",\"status\":\"affected\"},{\"version\":\"3.2.0 p3\",\"status\":\"affected\"},{\"version\":\"3.2.0 p4\",\"status\":\"affected\"},{\"version\":\"3.1.0 p8\",\"status\":\"affected\"},{\"version\":\"3.2.0 p5\",\"status\":\"affected\"},{\"version\":\"3.2.0 p6\",\"status\":\"affected\"},{\"version\":\"3.1.0 p9\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 2\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 1\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 3\",\"status\":\"affected\"},{\"version\":\"3.4.0\",\"status\":\"affected\"},{\"version\":\"3.2.0 p7\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 4\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 1\",\"status\":\"affected\"},{\"version\":\"3.1.0 p10\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 5\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 6\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 2\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 7\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 3\",\"status\":\"affected\"},{\"version\":\"3.5.0\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 4\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 8\",\"status\":\"affected\"},{\"version\":\"3.2 Patch 8\",\"status\":\"affected\"},{\"version\":\"3.5 Patch 1\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 9\",\"status\":\"affected\"},{\"version\":\"3.2 Patch 9\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 5\",\"status\":\"affected\"},{\"version\":\"3.5 Patch 3\",\"status\":\"affected\"},{\"version\":\"3.5 Patch 2\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 10\",\"status\":\"affected\"},{\"version\":\"3.3 Patch 11\",\"status\":\"affected\"},{\"version\":\"3.4 Patch 6\",\"status\":\"affected\"},{\"version\":\"3.2 Patch 10\",\"status\":\"affected\"},{\"version\":\"3.1.0 p72\",\"status\":\"affected\"},{\"version\":\"3.1.0 p11\",\"status\":\"affected\"},{\"version\":\"3.1.0 p12\",\"status\":\"affected\"},{\"version\":\"3.2 Patch 11\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":4.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-641\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-mult-vul-ymSsTLCc\",\"source\":\"psirt@cisco.com\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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