CVE-2021-35027 (GCVE-0-2021-35027)

Vulnerability from cvelistv5 – Published: 2021-09-29 10:32 – Updated: 2024-08-04 00:26
VLAI
Summary
A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information.
CWE
  • CWE-27 - Path Traversal: 'dir/../../filename'
References
Impacted products
Vendor Product Version CPE status
Zyxel ZyWALL VPN2S Firmware Affected: 1.12(ABLN.0)C0
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T00:26:55.923Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ZyWALL VPN2S Firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "1.12(ABLN.0)C0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-27",
              "description": "CWE-27: Path Traversal: \u0027dir/../../filename\u0027",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-09-29T10:32:04.000Z",
        "orgId": "96e50032-ad0d-4058-a115-4d2c13821f9f",
        "shortName": "Zyxel"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@zyxel.com.tw",
          "ID": "CVE-2021-35027",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "ZyWALL VPN2S Firmware",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "1.12(ABLN.0)C0"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Zyxel"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information."
            }
          ]
        },
        "impact": {
          "cvss": {
            "baseScore": "7.5",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-27: Path Traversal: \u0027dir/../../filename\u0027"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml",
              "refsource": "MISC",
              "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "96e50032-ad0d-4058-a115-4d2c13821f9f",
    "assignerShortName": "Zyxel",
    "cveId": "CVE-2021-35027",
    "datePublished": "2021-09-29T10:32:04.000Z",
    "dateReserved": "2021-06-17T00:00:00.000Z",
    "dateUpdated": "2024-08-04T00:26:55.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-35027",
      "date": "2026-10-04",
      "epss": "0.02045",
      "percentile": "0.80515"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:zyxel:zywall_vpn2s_firmware:1.12\\(abln.0\\)c0:*:*:*:*:*:*:*",
                  "matchCriteriaId": "E93F6084-B93D-4D50-85C6-1D8C375D8E34",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            },
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:h:zyxel:zywall_vpn2s:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "3D3F001A-8790-463F-804B-CA5CAC610867",
                  "vulnerable": false
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information."
        },
        {
          "lang": "es",
          "value": "Una vulnerabilidad de salto de directorio en el servidor web de  Zyxel VPN2S versi\u00f3n del firmware 1.12, podr\u00eda permitir a un atacante remoto acceder a informaci\u00f3n confidencial"
        }
      ],
      "id": "CVE-2021-35027",
      "lastModified": "2024-11-21T06:11:42.023",
      "metrics": {
        "cvssMetricV2": [
          {
            "acInsufInfo": false,
            "baseSeverity": "MEDIUM",
            "cvssData": {
              "accessComplexity": "LOW",
              "accessVector": "NETWORK",
              "authentication": "NONE",
              "availabilityImpact": "NONE",
              "baseScore": 5.0,
              "confidentialityImpact": "PARTIAL",
              "integrityImpact": "NONE",
              "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
              "version": "2.0"
            },
            "exploitabilityScore": 10.0,
            "impactScore": 2.9,
            "obtainAllPrivilege": false,
            "obtainOtherPrivilege": false,
            "obtainUserPrivilege": false,
            "source": "nvd@nist.gov",
            "type": "Primary",
            "userInteractionRequired": false
          }
        ],
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            },
            "exploitabilityScore": 3.9,
            "impactScore": 3.6,
            "source": "security@zyxel.com.tw",
            "type": "Secondary"
          },
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            },
            "exploitabilityScore": 3.9,
            "impactScore": 3.6,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2021-09-29T11:15:07.497",
      "references": [
        {
          "source": "security@zyxel.com.tw",
          "tags": [
            "Patch",
            "Vendor Advisory"
          ],
          "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch",
            "Vendor Advisory"
          ],
          "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
        }
      ],
      "sourceIdentifier": "security@zyxel.com.tw",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-27"
            }
          ],
          "source": "security@zyxel.com.tw",
          "type": "Secondary"
        },
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-22"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:zyxel:zywall_vpn2s_firmware:1.12\\(abln.0\\)c0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E93F6084-B93D-4D50-85C6-1D8C375D8E34",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:zyxel:zywall_vpn2s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "3D3F001A-8790-463F-804B-CA5CAC610867",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information."
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad de salto de directorio en el servidor web de  Zyxel VPN2S versi\u00f3n del firmware 1.12, podr\u00eda permitir a un atacante remoto acceder a informaci\u00f3n confidencial"
          }
        ],
        "id": "CVE-2021-35027",
        "lastModified": "2024-11-21T06:11:42.023",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 5.0,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security@zyxel.com.tw",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-09-29T11:15:07.497",
        "references": [
          {
            "source": "security@zyxel.com.tw",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml"
          }
        ],
        "sourceIdentifier": "security@zyxel.com.tw",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-27"
              }
            ],
            "source": "security@zyxel.com.tw",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-22"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-27T13:52:49+00:00",
      "cve": "CVE-2021-35027",
      "id": "CVE-2021-35027",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-35027",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-35027.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Loading…

Loading…

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.


Loading…