Vulnerability-Lookup

FKIE_CVE-2021-34761

Vulnerability from fkie_nvd - Published: 2021-10-27 19:15 - Updated: 2026-08-11 19:33

Severity

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

Summary

A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.

References

	URL	Tags
	psirt@cisco.com	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc	Vendor Advisory

Impacted products

Vendor	Product	Version
cisco	firepower_management_center_virtual_appliance	6.2.3
cisco	firepower_management_center_virtual_appliance	6.4.0
cisco	firepower_management_center_virtual_appliance	6.6.1
cisco	firepower_management_center_virtual_appliance	6.7.0
cisco	firepower_management_center_virtual_appliance	7.0.0
cisco	firepower_management_center_virtual_appliance	7.1.0
cisco	secure_firewall_threat_defense	*
cisco	secure_firewall_threat_defense	*
cisco	secure_firewall_threat_defense	*
cisco	secure_firewall_threat_defense	*
cisco	sourcefire_defense_center	6.2.3
cisco	sourcefire_defense_center	6.4.0
cisco	sourcefire_defense_center	6.6.1
cisco	sourcefire_defense_center	6.7.0
cisco	sourcefire_defense_center	7.0.0
cisco	sourcefire_defense_center	7.1.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco Firepower Threat Defense Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.2.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "F75D9CB4-406B-4FBF-BC7A-35C2CCEFD8B2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "2C0FC62F-65AD-4855-953A-DA5BBFC1B2E1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.6.1:*:*:*:*:*:*:*",
              "matchCriteriaId": "B11AE299-AE40-42EB-9C0B-3865C932E766",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "DA792E5D-7270-4C23-A8D6-22EB00CB21A2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:7.0.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "0CB38685-4255-4565-98AA-234B9DEEADE3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:7.1.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "7CF689E1-22FF-467F-B5A7-59833D77971E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5A060F4D-6782-4155-9FA5-817828761645",
              "versionEndExcluding": "6.4.0.13",
              "versionStartIncluding": "6.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D230F19E-75D2-4129-815C-D315E9062255",
              "versionEndExcluding": "6.6.5",
              "versionStartIncluding": "6.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AEC6CF5C-9A31-41B0-99EA-FB2734E4CFDD",
              "versionEndExcluding": "6.7.0.3",
              "versionStartIncluding": "6.7.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7DA0538F-DF6A-4114-A6F7-30B11683075E",
              "versionEndExcluding": "7.0.1",
              "versionStartIncluding": "7.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:6.2.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "5E4A3574-53DC-4328-A229-87795AE4F7AF",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:6.4.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "2EBC6544-6ADF-4F95-A969-A8D953D11B3A",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:6.6.1:*:*:*:*:*:*:*",
              "matchCriteriaId": "2B02800C-6420-4758-89CF-66F47B4FCA19",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:6.7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "3F41081E-06CF-4BA2-9072-E18D9032BEBC",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:7.0.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "52ED507A-5075-4444-A2D1-F5657453AD3F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:sourcefire_defense_center:7.1.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "F5E9A6F5-8BC2-4FA5-9920-E980EFC5BCEE",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el software Cisco Firepower Threat Defense (FTD) podr\u00eda permitir a un atacante local autenticado sobrescribir o a\u00f1adir datos arbitrarios a los archivos del sistema usando privilegios de nivel de root. El atacante debe tener credenciales administrativas en el dispositivo. Esta vulnerabilidad es debido a una comprobaci\u00f3n incompleta de la entrada del usuario para un comando CLI espec\u00edfico. Un atacante podr\u00eda explotar esta vulnerabilidad al autenticarse en el dispositivo con privilegios administrativos y emitiendo un comando CLI con par\u00e1metros de usuario dise\u00f1ados. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante sobrescribir o a\u00f1adir datos arbitrarios a los archivos del sistema usando privilegios de nivel root"
    }
  ],
  "id": "CVE-2021-34761",
  "lastModified": "2026-08-11T19:33:44.513",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 6.6,
          "confidentialityImpact": "NONE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 9.2,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 3.6,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.0,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-34761",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-07T21:39:50.562966Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-10-27T19:15:08.003",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-668"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-34761 (GCVE-0-2021-34761)

Vulnerability from cvelistv5 – Published: 2021-10-27 18:55 – Updated: 2024-11-07 21:44

Title

Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability

Summary

Severity

4.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-11-07 21:39 UTC

CWE

CWE-73

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://tools.cisco.com/security/center/content/C…	vendor-advisoryx_refsource_CISCO

Impacted products

1 product

Vendor	Product	Version
Cisco	Cisco Firepower Threat Defense Software	Affected: n/a

Date Public

2021-10-27 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T00:19:48.218Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "20211027 Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability",
            "tags": [
              "vendor-advisory",
              "x_refsource_CISCO",
              "x_transferred"
            ],
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-34761",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-11-07T21:39:50.562966Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-07T21:44:29.552Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco Firepower Threat Defense Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2021-10-27T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
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      "problemTypes": [
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      ],
      "providerMetadata": {
        "dateUpdated": "2021-10-27T18:55:30.000Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "20211027 Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability",
          "tags": [
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            "x_refsource_CISCO"
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          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-write-SHVcmQVc"
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        "defect": [
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        "discovery": "INTERNAL"
      },
      "title": "Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability",
      "x_legacyV4Record": {
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          "ASSIGNER": "psirt@cisco.com",
          "DATE_PUBLIC": "2021-10-27T16:00:00",
          "ID": "CVE-2021-34761",
          "STATE": "PUBLIC",
          "TITLE": "Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability"
        },
        "affects": {
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            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Cisco Firepower Threat Defense Software",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
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                "vendor_name": "Cisco"
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        "data_format": "MITRE",
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        "description": {
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              "lang": "eng",
              "value": "A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges."
            }
          ]
        },
        "exploit": [
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            }
          ]
        },
        "source": {
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          "defect": [
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  "cveMetadata": {
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    "assignerShortName": "cisco",
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    "dateUpdated": "2024-11-07T21:44:29.552Z",
    "state": "PUBLISHED"
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}

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.