CVE-2021-27692 (GCVE-0-2021-27692)

Vulnerability from cvelistv5 – Published: 2021-04-15 23:14 – Updated: 2024-08-03 21:26
VLAI Shadowserver Previdian
Summary
Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted "action/umountUSBPartition" request. This occurs because the "formSetUSBPartitionUmount" function executes the "doSystemCmd" function with untrusted input.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2251 records in the last 180 days details
References
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3396996f-b1d0-484f-9dd4-f1a1aa7b4cd0

Vulnerability ID: CVE-2021-27692

Status: Confirmed

Status Updated: 2026-10-05 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2025-06-08
Asserted: 2025-06-08
Last Seen: 2026-10-05
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Tenda / Tenda G1 and G3 | Class: router | Severity: Critical (CVSS 9.8) | IoT: yes | In CISA KEV: no | Honeypot connections on 2026-10-05: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 0
Vendor Tenda
30D Avg 0
90D Avg 0
Product Tenda G1 and G3
Cisa Kev no
Connections 1
Observation Date 2026-10-05
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-07-01 07:18 UTC | Updated: 2026-10-21 09:13 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f54faa96-a3e6-4cb7-9d50-a3ab4d593961

Vulnerability ID: CVE-2021-27692

Status: Confirmed

Status Updated: 2021-04-15 23:14 UTC

Exploited: Yes

Timestamps
First Seen: 2021-04-15
Asserted: 2021-04-15
Scope
Notes: Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute... | Affected: Tenda / G1 and G3 routers | CVSS: 9.8 (CRITICAL) | EPSS: 0.03194 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute...
Cve Id CVE-2021-27692
Vendor Tenda
Ghsa Id GHSA-RXJ2-G98J-WFHH
Product G1 and G3 routers
Added Date 2021-04-15T23:14:32.000Z
Cvss Score 9.8
Epss Score 0.03194
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.88127
Used In Malware unknown
Vulnerability Id CVE-2021-27692
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-11-04 13:00 UTC | Updated: 2026-11-04 13:00 UTC
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T21:26:10.675Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted \"action/umountUSBPartition\" request. This occurs because the \"formSetUSBPartitionUmount\" function executes the \"doSystemCmd\" function with untrusted input."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-04-15T23:14:32.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-27692",
          "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": "Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted \"action/umountUSBPartition\" request. This occurs because the \"formSetUSBPartitionUmount\" function executes the \"doSystemCmd\" function with untrusted input."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://hackmd.io/@aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu",
              "refsource": "MISC",
              "url": "https://hackmd.io/@aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-27692",
    "datePublished": "2021-04-15T23:14:32.000Z",
    "dateReserved": "2021-02-25T00:00:00.000Z",
    "dateUpdated": "2024-08-03T21:26:10.675Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-27692",
      "date": "2026-11-04",
      "epss": "0.03194",
      "percentile": "0.88147"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:tendacn:g1_firmware:15.11.0.16\\(9024\\)_cn:*:*:*:*:*:*:*",
                    "matchCriteriaId": "10886B9B-E33E-4748-93BB-3617EF40BF3D",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:tendacn:g1_firmware:15.11.0.17\\(9502\\)_cn:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F1F4A805-B82C-4815-9999-E2D971E082E8",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:tendacn:g1:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6839E6D3-4F3E-40FB-828E-D25088E85A21",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:tendacn:g3_firmware:15.11.0.16\\(9024\\)_cn:*:*:*:*:*:*:*",
                    "matchCriteriaId": "91B52B9F-BBF3-4BDD-8CF1-C253959E4182",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:tendacn:g3_firmware:15.11.0.17\\(9502\\)_cn:*:*:*:*:*:*:*",
                    "matchCriteriaId": "67707336-51C8-428B-B4E2-084302C5806D",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:tendacn:g3:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0A5CDD3E-C5D2-44DF-B330-065CF8ECC29B",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Command Injection in Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted \"action/umountUSBPartition\" request. This occurs because the \"formSetUSBPartitionUmount\" function executes the \"doSystemCmd\" function with untrusted input."
          },
          {
            "lang": "es",
            "value": "La inyecci\u00f3n de comandos en enrutadores Tenda G1 y G3 con versiones de firmware v15.11.0.17(9502) _CN o v15.11.0.16(9024) _CN, permite a atacantes remotos ejecutar comandos arbitrarios del sistema operativo a trav\u00e9s de una petici\u00f3n \"action/umountUSBPartition\" dise\u00f1ada.\u0026#xa0;Esto ocurre porque la funci\u00f3n \"formSetUSBPartitionUmount\" ejecuta la funci\u00f3n \"doSystemCmd\" con una entrada no confiable"
          }
        ],
        "id": "CVE-2021-27692",
        "lastModified": "2024-11-21T05:58:26.020",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "HIGH",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "COMPLETE",
                "baseScore": 10.0,
                "confidentialityImpact": "COMPLETE",
                "integrityImpact": "COMPLETE",
                "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 10.0,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-04-16T00:15:12.067",
        "references": [
          {
            "source": "cve@mitre.org",
            "url": "https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-78"
              },
              {
                "lang": "en",
                "value": "CWE-119"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:24:03+00:00",
      "cve": "CVE-2021-27692",
      "id": "CVE-2021-27692",
      "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-2021-27692",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-27692.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.