Vulnerability-Lookup

FKIE_CVE-2021-39933

Vulnerability from fkie_nvd - Published: 2021-12-13 16:15 - Updated: 2026-06-17 04:04

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.10 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression used for handling user input (notes, comments, etc) was susceptible to catastrophic backtracking that could cause a DOS attack.

References

URL	Tags
cve@gitlab.com	https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json	Third Party Advisory
cve@gitlab.com	https://gitlab.com/gitlab-org/gitlab/-/issues/340449	Broken Link
cve@gitlab.com	https://hackerone.com/reports/1320077	Permissions Required, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://gitlab.com/gitlab-org/gitlab/-/issues/340449	Broken Link
af854a3a-2127-422b-91ae-364da2661108	https://hackerone.com/reports/1320077	Permissions Required, Third Party Advisory

Impacted products

Vendor	Product	Version
gitlab	gitlab	*
gitlab	gitlab	*
gitlab	gitlab	*
gitlab	gitlab	*
gitlab	gitlab	*
gitlab	gitlab	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "GitLab",
          "vendor": "GitLab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e=12.10, \u003c14.3.6"
            },
            {
              "status": "affected",
              "version": "\u003e=14.4, \u003c14.4.4"
            },
            {
              "status": "affected",
              "version": "\u003e=14.5, \u003c14.5.2"
            }
          ]
        }
      ],
      "source": "cve@gitlab.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "matchCriteriaId": "F093F933-8552-46D5-8B05-34587C104DFF",
              "versionEndExcluding": "14.3.6",
              "versionStartIncluding": "12.10.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "matchCriteriaId": "47495883-D8D0-485E-9920-993CF00199FF",
              "versionEndExcluding": "14.3.6",
              "versionStartIncluding": "12.10.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "matchCriteriaId": "1E801B5F-9C94-4CB2-89ED-D071E567132C",
              "versionEndExcluding": "14.4.4",
              "versionStartIncluding": "14.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "matchCriteriaId": "7C38F838-02EA-4E2F-8493-57DD401EF911",
              "versionEndExcluding": "14.4.4",
              "versionStartIncluding": "14.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "matchCriteriaId": "95F59DF7-707C-4C43-8352-8115DAF1C533",
              "versionEndExcluding": "14.5.2",
              "versionStartIncluding": "14.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "matchCriteriaId": "64F26CC0-C99A-4748-963B-944F39E4B647",
              "versionEndExcluding": "14.5.2",
              "versionStartIncluding": "14.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.10 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression used for handling user input (notes, comments, etc) was susceptible to catastrophic backtracking that could cause a DOS attack."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en GitLab CE/EE afectando a todas las versiones a partir de 12.10 anteriores a 14.3.6, a todas las versiones a partir de 14.4 anteriores a 14.4.4, a todas las versiones a partir de 14.5 anteriores a 14.5.2. Una expresi\u00f3n regular usada para el manejo de la entrada del usuario (notas, comentarios, etc) era susceptible de un retroceso catastr\u00f3fico que pod\u00eda causar un ataque DOS"
    }
  ],
  "id": "CVE-2021-39933",
  "lastModified": "2026-06-17T04:04:27.160",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "cve@gitlab.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-12-13T16:15:09.250",
  "references": [
    {
      "source": "cve@gitlab.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json"
    },
    {
      "source": "cve@gitlab.com",
      "tags": [
        "Broken Link"
      ],
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449"
    },
    {
      "source": "cve@gitlab.com",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "url": "https://hackerone.com/reports/1320077"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Broken Link"
      ],
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "url": "https://hackerone.com/reports/1320077"
    }
  ],
  "sourceIdentifier": "cve@gitlab.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-39933 (GCVE-0-2021-39933)

Vulnerability from cvelistv5 – Published: 2021-12-13 15:47 – Updated: 2024-08-04 02:20

Summary

Severity

4.3 (Medium)


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

CWE

Uncontrolled resource consumption in GitLab

Assigner

GitLab mitre root

References

3 references

URL	Tags
https://gitlab.com/gitlab-org/gitlab/-/issues/340449	x_refsource_MISC
https://hackerone.com/reports/1320077	x_refsource_MISC
https://gitlab.com/gitlab-org/cves/-/blob/master/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
GitLab	GitLab	Affected: >=12.10, <14.3.6 Affected: >=14.4, <14.4.4 Affected: >=14.5, <14.5.2

Credits

Thanks @hashkitten, for reporting this vulnerability through our HackerOne bug bounty program

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T02:20:34.065Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://hackerone.com/reports/1320077"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "GitLab",
          "vendor": "GitLab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e=12.10, \u003c14.3.6"
            },
            {
              "status": "affected",
              "version": "\u003e=14.4, \u003c14.4.4"
            },
            {
              "status": "affected",
              "version": "\u003e=14.5, \u003c14.5.2"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Thanks @hashkitten, for reporting this vulnerability through our HackerOne bug bounty program"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.10 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression used for handling user input (notes, comments, etc) was susceptible to catastrophic backtracking that could cause a DOS attack."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Uncontrolled resource consumption in GitLab",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-12-13T15:47:53.000Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/1320077"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@gitlab.com",
          "ID": "CVE-2021-39933",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "GitLab",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003e=12.10, \u003c14.3.6"
                          },
                          {
                            "version_value": "\u003e=14.4, \u003c14.4.4"
                          },
                          {
                            "version_value": "\u003e=14.5, \u003c14.5.2"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "GitLab"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "Thanks @hashkitten, for reporting this vulnerability through our HackerOne bug bounty program"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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            {
              "lang": "eng",
              "value": "An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.10 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression used for handling user input (notes, comments, etc) was susceptible to catastrophic backtracking that could cause a DOS attack."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
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        },
        "problemtype": {
          "problemtype_data": [
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                  "value": "Uncontrolled resource consumption in GitLab"
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          ]
        },
        "references": {
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            {
              "name": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449",
              "refsource": "MISC",
              "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340449"
            },
            {
              "name": "https://hackerone.com/reports/1320077",
              "refsource": "MISC",
              "url": "https://hackerone.com/reports/1320077"
            },
            {
              "name": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json",
              "refsource": "CONFIRM",
              "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2021-39933",
    "datePublished": "2021-12-13T15:47:53.000Z",
    "dateReserved": "2021-08-23T00:00:00.000Z",
    "dateUpdated": "2024-08-04T02:20:34.065Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.