CVE-2021-21974 (GCVE-0-2021-21974)
Vulnerability from cvelistv5
Published
2021-02-24 16:57
Modified
2026-06-02 20:00
CWE
  • OpenSLP heap-overflow vulnerability
Summary
OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.
Impacted products
Vendor Product Version
n/a VMware ESXi Version: 7.0 before ESXi70U1c-17325551
Version: 6.7 before ESXi670-202102401-SG
Version: 6.5 before ESXi650-202102101-SG
   n/a VMware Cloud Foundation Version: 4.x before 4.2 and 3.x
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:30:23.578Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://www.vmware.com/security/advisories/VMSA-2021-0002.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-250/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "ADJACENT_NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-21974",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T20:00:30.249549Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-02T20:00:52.080Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "VMware ESXi",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "7.0 before ESXi70U1c-17325551"
            },
            {
              "status": "affected",
              "version": "6.7 before ESXi670-202102401-SG"
            },
            {
              "status": "affected",
              "version": "6.5 before ESXi650-202102101-SG"
            }
          ]
        },
        {
          "product": "VMware Cloud Foundation",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "4.x before 4.2 and 3.x"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "OpenSLP heap-overflow vulnerability",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-06-03T17:06:15.000Z",
        "orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
        "shortName": "vmware"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://www.vmware.com/security/advisories/VMSA-2021-0002.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-250/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@vmware.com",
          "ID": "CVE-2021-21974",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "VMware ESXi",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "7.0 before ESXi70U1c-17325551"
                          },
                          {
                            "version_value": "6.7 before ESXi670-202102401-SG"
                          },
                          {
                            "version_value": "6.5 before ESXi650-202102101-SG"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "VMware Cloud Foundation",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "4.x before 4.2 and 3.x"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "OpenSLP heap-overflow vulnerability"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.vmware.com/security/advisories/VMSA-2021-0002.html",
              "refsource": "CONFIRM",
              "url": "https://www.vmware.com/security/advisories/VMSA-2021-0002.html"
            },
            {
              "name": "https://www.zerodayinitiative.com/advisories/ZDI-21-250/",
              "refsource": "MISC",
              "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-250/"
            },
            {
              "name": "http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html",
              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
    "assignerShortName": "vmware",
    "cveId": "CVE-2021-21974",
    "datePublished": "2021-02-24T16:57:33.000Z",
    "dateReserved": "2021-01-04T00:00:00.000Z",
    "dateUpdated": "2026-06-02T20:00:52.080Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-250/\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T18:30:23.578Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.8, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:A/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-2021-21974\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-02T20:00:30.249549Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-02T20:00:38.959Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"VMware ESXi\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.0 before ESXi70U1c-17325551\"}, {\"status\": \"affected\", \"version\": \"6.7 before ESXi670-202102401-SG\"}, {\"status\": \"affected\", \"version\": \"6.5 before ESXi650-202102101-SG\"}]}, {\"vendor\": \"n/a\", \"product\": \"VMware Cloud Foundation\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.x before 4.2 and 3.x\"}]}], \"references\": [{\"url\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-250/\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"OpenSLP heap-overflow vulnerability\"}]}], \"providerMetadata\": {\"orgId\": \"dcf2e128-44bd-42ed-91e8-88f912c1401d\", \"shortName\": \"vmware\", \"dateUpdated\": \"2021-06-03T17:06:15.000Z\"}, \"x_legacyV4Record\": {\"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"7.0 before ESXi70U1c-17325551\"}, {\"version_value\": \"6.7 before ESXi670-202102401-SG\"}, {\"version_value\": \"6.5 before ESXi650-202102101-SG\"}]}, \"product_name\": \"VMware ESXi\"}, {\"version\": {\"version_data\": [{\"version_value\": \"4.x before 4.2 and 3.x\"}]}, \"product_name\": \"VMware Cloud Foundation\"}]}, \"vendor_name\": \"n/a\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"name\": \"https://www.vmware.com/security/advisories/VMSA-2021-0002.html\", \"refsource\": \"CONFIRM\"}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-250/\", \"name\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-250/\", \"refsource\": \"MISC\"}, {\"url\": \"http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html\", \"name\": \"http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html\", \"refsource\": \"MISC\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"OpenSLP heap-overflow vulnerability\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-21974\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"security@vmware.com\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-21974\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-02T20:00:52.080Z\", \"dateReserved\": \"2021-01-04T00:00:00.000Z\", \"assignerOrgId\": \"dcf2e128-44bd-42ed-91e8-88f912c1401d\", \"datePublished\": \"2021-02-24T16:57:33.000Z\", \"assignerShortName\": \"vmware\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.


Loading…

Loading…