GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2020-8150 (GCVE-0-2020-8150)

Vulnerability from cvelistv5 – Published: 2020-11-09 14:19 – Updated: 2024-08-04 09:48
VLAI
Summary
A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.
Severity
4.1 (Medium)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-310 - Cryptographic Issues - Generic (CWE-310)
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a Nextcloud Server Affected: 19.0.2
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T09:48:25.666Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://hackerone.com/reports/742588"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039"
          },
          {
            "name": "20201225 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/55"
          },
          {
            "name": "20201229 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
          },
          {
            "name": "20201229 Re: CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Nextcloud Server",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "19.0.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-310",
              "description": "Cryptographic Issues - Generic (CWE-310)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-12-29T10:06:12.000Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/742588"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039"
        },
        {
          "name": "20201225 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/Dec/55"
        },
        {
          "name": "20201229 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
        },
        {
          "name": "20201229 Re: CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "support@hackerone.com",
          "ID": "CVE-2020-8150",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Nextcloud Server",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "19.0.2"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Cryptographic Issues - Generic (CWE-310)"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://hackerone.com/reports/742588",
              "refsource": "MISC",
              "url": "https://hackerone.com/reports/742588"
            },
            {
              "name": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039",
              "refsource": "MISC",
              "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039"
            },
            {
              "name": "20201225 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/Dec/55"
            },
            {
              "name": "20201229 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
            },
            {
              "name": "20201229 Re: CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2020-8150",
    "datePublished": "2020-11-09T14:19:42.000Z",
    "dateReserved": "2020-01-28T00:00:00.000Z",
    "dateUpdated": "2024-08-04T09:48:25.666Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2020-8150",
      "date": "2026-09-20",
      "epss": "0.00289",
      "percentile": "0.21767"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "DC2E71AB-4078-49DD-B276-7CC5990A792B",
                    "versionEndExcluding": "19.0.2",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files."
          },
          {
            "lang": "es",
            "value": "Un problema criptogr\u00e1fico en Nextcloud Server versi\u00f3n 19.0.1, permiti\u00f3 a un atacante degradar el esquema de cifrado y romper la integridad de los archivos cifrados"
          }
        ],
        "id": "CVE-2020-8150",
        "lastModified": "2024-11-21T05:38:23.413",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "LOW",
              "cvssData": {
                "accessComplexity": "MEDIUM",
                "accessVector": "LOCAL",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 1.9,
                "confidentialityImpact": "NONE",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:L/AC:M/Au:N/C:N/I:P/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 3.4,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 4.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.5,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2020-11-09T15:15:13.443",
        "references": [
          {
            "source": "support@hackerone.com",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/55"
          },
          {
            "source": "support@hackerone.com",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
          },
          {
            "source": "support@hackerone.com",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
          },
          {
            "source": "support@hackerone.com",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://hackerone.com/reports/742588"
          },
          {
            "source": "support@hackerone.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/55"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/57"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/Dec/58"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://hackerone.com/reports/742588"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039"
          }
        ],
        "sourceIdentifier": "support@hackerone.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-310"
              }
            ],
            "source": "support@hackerone.com",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-311"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2025-11-21T16:59:23+00:00",
      "cve": "CVE-2020-8150",
      "id": "CVE-2020-8150",
      "initial_release_date": "2020-11-09T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nextcloud: Encryption scheme downgrade vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8150.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.