Vulnerability-Lookup

UBUNTU-CVE-2021-40906 (CVE-2021-40906)

Vulnerability from osv_ubuntu – Published: 2022-03-25 23:15 – Updated: 2025-09-08 16:47 – Source website

Details

CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.

Severity

6.1 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-40906	REPORT
	https://checkmk.com/werk/13192	REPORT
	https://github.com/Edgarloyola/CVE-2021-40906	REPORT
	https://ubuntu.com/security/notices/USN-5527-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-40906	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "check-mk-agent",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-agent-logwatch",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-config-icinga",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-livestatus",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-multisite",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-server",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "check-mk",
        "purl": "pkg:deb/ubuntu/check-mk@1.2.8p16-1ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.8p16-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.8p16-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.",
  "id": "UBUNTU-CVE-2021-40906",
  "modified": "2025-09-08T16:47:22Z",
  "published": "2022-03-25T23:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-40906"
    },
    {
      "type": "REPORT",
      "url": "https://checkmk.com/werk/13192"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Edgarloyola/CVE-2021-40906"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5527-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-40906"
    }
  ],
  "related": [
    "USN-5527-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-40906"
  ]
}

CVE-2021-40906 (GCVE-0-2021-40906)

Vulnerability from cvelistv5 – Published: 2022-03-25 22:20 – Updated: 2026-07-09 00:14

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/Edgarloyola/CVE-2021-40906

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-09T00:14:50.239Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/Edgarloyola/CVE-2021-40906"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-05T00:04:48.365Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/Edgarloyola/CVE-2021-40906"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-40906",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "http://checkmk.com",
              "refsource": "MISC",
              "url": "http://checkmk.com"
            },
            {
              "name": "https://github.com/Edgarloyola/CVE-2021-40906",
              "refsource": "MISC",
              "url": "https://github.com/Edgarloyola/CVE-2021-40906"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-40906",
    "datePublished": "2022-03-25T22:20:04.000Z",
    "dateReserved": "2021-09-13T00:00:00.000Z",
    "dateUpdated": "2026-07-09T00:14:50.239Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

USN-5527-1 (UBUNTU-CVE-2017-9781)

Vulnerability from osv_ubuntu – Published: 2022-07-20 08:36 – Updated: 2026-02-10 04:42 – Source website

Summary

check-mk vulnerabilities

Details

It was discovered that Checkmk incorrectly handled authentication. An attacker could possibly use this issue to cause a race condition leading to information disclosure. (CVE-2017-14955)

It was discovered that Checkmk incorrectly handled certain inputs. An attacker could use these cross-site scripting issues to inject arbitrary html or javascript code to obtain sensitive information including user information, session cookies and valid credentials. (CVE-2017-9781, CVE-2021-36563, CVE-2021-40906, CVE-2022-24565)

References

URL

Type

	https://ubuntu.com/security/notices/USN-5527-1	ADVISORY
	https://ubuntu.com/security/CVE-2017-9781	REPORT
	https://ubuntu.com/security/CVE-2017-14955	REPORT
	https://ubuntu.com/security/CVE-2021-36563	REPORT
	https://ubuntu.com/security/CVE-2021-40906	REPORT
	https://ubuntu.com/security/CVE-2022-24565	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2017-9781",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2017-14955",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-36563",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-40906",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2022-24565",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "check-mk-agent",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-agent-logwatch",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-config-icinga",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-livestatus",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-multisite",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-server",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "check-mk",
        "purl": "pkg:deb/ubuntu/check-mk@1.2.8p16-1ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.8p16-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.8p16-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Checkmk incorrectly handled authentication. An attacker \ncould possibly use this issue to cause a race condition leading to information \ndisclosure. (CVE-2017-14955)\n\nIt was discovered that Checkmk incorrectly handled certain inputs. An attacker\ncould use these cross-site scripting issues to inject arbitrary html or \njavascript code to obtain sensitive information including user information, \nsession cookies and valid credentials. (CVE-2017-9781, CVE-2021-36563, \nCVE-2021-40906, CVE-2022-24565)\n",
  "id": "USN-5527-1",
  "modified": "2026-02-10T04:42:42Z",
  "published": "2022-07-20T08:36:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5527-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-9781"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-14955"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-36563"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-40906"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2022-24565"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "check-mk vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2017-9781",
    "UBUNTU-CVE-2017-14955",
    "UBUNTU-CVE-2021-36563",
    "UBUNTU-CVE-2021-40906",
    "UBUNTU-CVE-2022-24565"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

UBUNTU-CVE-2021-40906 (CVE-2021-40906)

CVE-2021-40906 (GCVE-0-2021-40906)

USN-5527-1 (UBUNTU-CVE-2017-9781)

Tags

Sightings

Nomenclature

Related by attack behaviour