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CVE-2021-26556

Estado: ModificadaAlta (7.8)—

When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Octopus — Octopus DeployOctopus — Octopus Server

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-26556",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.4,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@octopus.com",
      "affectedData": [
        {
          "vendor": "Octopus Deploy",
          "product": "Octopus Server",
          "versions": [
            {
              "status": "affected",
              "version": "0.9",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "2020.4.229",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "2020.5.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "2020.5.256",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-07T01:15:07.010",
  "references": [
    {
      "url": "https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-%28CVE-2021-26556%29.1733296189.html",
      "source": "security@octopus.com"
    },
    {
      "url": "https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-%28CVE-2021-26556%29.1733296189.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-426"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access."
    },
    {
      "lang": "es",
      "value": "Cuando Octopus Server se instala usando una ubicación de carpeta personalizada, las ACL de carpeta no se establecen correctamente y podrían conllevar a que un usuario no privilegiado use una carga lateral de DLL para conseguir acceso privilegiado"
    }
  ],
  "lastModified": "2026-06-17T03:43:28.243",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:octopus:octopus_deploy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BB1A49F9-06B0-435A-9A46-4BF727C4DE03",
              "versionEndExcluding": "2020.4.229",
              "versionStartIncluding": "0.9"
            },
            {
              "criteria": "cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EF275C0A-3A31-4751-9C65-CEC4B22CB6EC",
              "versionEndExcluding": "2020.5.256",
              "versionStartIncluding": "2020.5.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@octopus.com"
}