cve-2021-20090
Vulnerability from cvelistv5
Published
2021-04-29 00:00
Modified
2025-02-06 20:25
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.
References
vulnreport@tenable.comhttps://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
vulnreport@tenable.comhttps://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
vulnreport@tenable.comhttps://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
Impacted products
Vendor Product Version
n/a Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 Version: WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog

Date added: 2021-11-03

Due date: 2021-11-17

Required action: Apply updates per vendor instructions.

Used in ransomware: Unknown

Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-20090

Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:30:07.572Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.tenable.com/security/research/tra-2021-13"
          },
          {
            "name": "VU#914124",
            "tags": [
              "third-party-advisory",
              "x_transferred"
            ],
            "url": "https://www.kb.cert.org/vuls/id/914124"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-20090",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-06T20:25:22.891349Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2021-11-03",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20090"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-22",
                "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-06T20:25:29.587Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "WSR-2533DHPL2 \u003c=1.02, WSR-2533DHP3 \u003c= 1.24"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Path Traversal",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-10-18T11:29:20.400Z",
        "orgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
        "shortName": "tenable"
      },
      "references": [
        {
          "url": "https://www.tenable.com/security/research/tra-2021-13"
        },
        {
          "name": "VU#914124",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.kb.cert.org/vuls/id/914124"
        },
        {
          "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
    "assignerShortName": "tenable",
    "cveId": "CVE-2021-20090",
    "datePublished": "2021-04-29T00:00:00.000Z",
    "dateReserved": "2020-12-17T00:00:00.000Z",
    "dateUpdated": "2025-02-06T20:25:29.587Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2021-20090",
      "cwes": "[\"CWE-22\"]",
      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20090",
      "product": "Buffalo Firmware",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication and access sensitive information. This vulnerability affects multiple routers across several different vendors.",
      "vendorProject": "Arcadyan",
      "vulnerabilityName": "Arcadyan Buffalo Firmware Path Traversal Vulnerability"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-20090\",\"sourceIdentifier\":\"vulnreport@tenable.com\",\"published\":\"2021-04-29T15:15:10.630\",\"lastModified\":\"2025-02-06T21:15:16.230\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de salto de ruta en las interfaces web de Buffalo WSR-2533DHPL2 versi\u00f3n de firmware anterior a 1.02 e incluy\u00e9ndola y WSR-2533DHP3 versi\u00f3n de firmware anterior a 1.24 e incluy\u00e9ndola, podr\u00eda permitir a atacantes remotos no autenticados omitir la autenticaci\u00f3n\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:P/A:P\",\"baseScore\":7.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"cisaExploitAdd\":\"2021-11-03\",\"cisaActionDue\":\"2021-11-17\",\"cisaRequiredAction\":\"Apply updates per vendor instructions.\",\"cisaVulnerabilityName\":\"Arcadyan Buffalo Firmware Path Traversal Vulnerability\",\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"1.02\",\"matchCriteriaId\":\"D861729C-023B-4D73-8C4C-BF7E8B0B7045\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1B03FA14-33E3-44D2-8165-197CB446F2D2\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"1.24\",\"matchCriteriaId\":\"63232EC8-B2B8-4867-93DB-C0C5147E2730\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7AA91D93-E2B9-4415-B541-1968F1F39814\"}]}]}],\"references\":[{\"url\":\"https://www.kb.cert.org/vuls/id/914124\",\"source\":\"vulnreport@tenable.com\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/\",\"source\":\"vulnreport@tenable.com\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/research/tra-2021-13\",\"source\":\"vulnreport@tenable.com\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://www.kb.cert.org/vuls/id/914124\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/research/tra-2021-13\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.tenable.com/security/research/tra-2021-13\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.kb.cert.org/vuls/id/914124\", \"name\": \"VU#914124\", \"tags\": [\"third-party-advisory\", \"x_transferred\"]}, {\"url\": \"https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T17:30:07.572Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 9.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-20090\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-06T20:25:22.891349Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20090\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-22\", \"description\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-06T20:24:37.327Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3\", \"versions\": [{\"status\": \"affected\", \"version\": \"WSR-2533DHPL2 \u003c=1.02, WSR-2533DHP3 \u003c= 1.24\"}]}], \"references\": [{\"url\": \"https://www.tenable.com/security/research/tra-2021-13\"}, {\"url\": \"https://www.kb.cert.org/vuls/id/914124\", \"name\": \"VU#914124\", \"tags\": [\"third-party-advisory\"]}, {\"url\": \"https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"Path Traversal\"}]}], \"providerMetadata\": {\"orgId\": \"5ac1ecc2-367a-4d16-a0b2-35d495ddd0be\", \"shortName\": \"tenable\", \"dateUpdated\": \"2023-10-18T11:29:20.400Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-20090\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-06T20:25:29.587Z\", \"dateReserved\": \"2020-12-17T00:00:00.000Z\", \"assignerOrgId\": \"5ac1ecc2-367a-4d16-a0b2-35d495ddd0be\", \"datePublished\": \"2021-04-29T00:00:00.000Z\", \"assignerShortName\": \"tenable\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.