GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2021-31987 (GCVE-0-2021-31987)

Vulnerability from cvelistv5 – Published: 2021-10-05 21:46 – Updated: 2024-11-08 08:20
VLAI
Summary
A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.
CWE
  • CWE-1286 - Improper Validation of Syntactic Correctness of Input
References
Impacted products
Vendor Product Version CPE status
Axis Communications AB AXIS OS Affected: AXIS OS 5.51 or later
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:10:31.317Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "AXIS OS",
          "vendor": "Axis Communications AB",
          "versions": [
            {
              "status": "affected",
              "version": "AXIS OS 5.51 or later"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.\u003c/p\u003e"
            }
          ],
          "value": "A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1286",
              "description": "CWE-1286: Improper Validation of Syntactic Correctness of Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-08T08:20:22.238Z",
        "orgId": "f2daf9a0-02c2-4b83-a01d-63b3b304b807",
        "shortName": "Axis"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "product-security@axis.com",
          "ID": "CVE-2021-31987",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "AXIS OS",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "AXIS OS 5.51 or later"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Improper input validation"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf",
              "refsource": "MISC",
              "url": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f2daf9a0-02c2-4b83-a01d-63b3b304b807",
    "assignerShortName": "Axis",
    "cveId": "CVE-2021-31987",
    "datePublished": "2021-10-05T21:46:45.000Z",
    "dateReserved": "2021-04-30T00:00:00.000Z",
    "dateUpdated": "2024-11-08T08:20:22.238Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-31987",
      "date": "2026-09-16",
      "epss": "0.00894",
      "percentile": "0.57714"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:axis:axis_os:*:*:*:*:active:*:*:*\", \"versionEndExcluding\": \"10.8\", \"matchCriteriaId\": \"F267E473-FA9F-4C5D-8BFE-D195372303DC\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:axis:axis_os_2016:*:*:*:*:lts:*:*:*\", \"versionEndExcluding\": \"6.50.5.5\", \"matchCriteriaId\": \"E99291A7-DDA8-4E90-9A0D-D4CFC8CEA93C\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:axis:axis_os_2018:*:*:*:*:lts:*:*:*\", \"versionEndExcluding\": \"8.40.4.3\", \"matchCriteriaId\": \"7DBF5FEA-1BE8-4A00-8195-028D38A9930F\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:axis:axis_os_2020:*:*:*:*:lts:*:*:*\", \"versionEndExcluding\": \"9.80.3.5\", \"matchCriteriaId\": \"33DFA815-B675-470B-8BD2-63326E700EF8\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.\"}, {\"lang\": \"es\", \"value\": \"Un par\\u00e1metro controlado por el usuario relacionado con la funcionalidad de prueba de SMTP no es comprobado correctamente, haciendo posible omitir los destinatarios de red bloqueados\"}]",
      "id": "CVE-2021-31987",
      "lastModified": "2024-11-21T06:06:40.320",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.6, \"impactScore\": 5.9}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:H/Au:N/C:P/I:P/A:P\", \"baseScore\": 5.1, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"HIGH\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 4.9, \"impactScore\": 6.4, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": true}]}",
      "published": "2021-10-05T22:15:07.887",
      "references": "[{\"url\": \"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf\", \"source\": \"product-security@axis.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "product-security@axis.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"product-security@axis.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-1286\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-Other\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-31987\",\"sourceIdentifier\":\"product-security@axis.com\",\"published\":\"2021-10-05T22:15:07.887\",\"lastModified\":\"2024-11-21T06:06:40.320\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.\"},{\"lang\":\"es\",\"value\":\"Un par\u00e1metro controlado por el usuario relacionado con la funcionalidad de prueba de SMTP no es comprobado correctamente, haciendo posible omitir los destinatarios de red bloqueados\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.6,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:H/Au:N/C:P/I:P/A:P\",\"baseScore\":5.1,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"HIGH\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":4.9,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"weaknesses\":[{\"source\":\"product-security@axis.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1286\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:axis:axis_os:*:*:*:*:active:*:*:*\",\"versionEndExcluding\":\"10.8\",\"matchCriteriaId\":\"F267E473-FA9F-4C5D-8BFE-D195372303DC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:axis:axis_os_2016:*:*:*:*:lts:*:*:*\",\"versionEndExcluding\":\"6.50.5.5\",\"matchCriteriaId\":\"E99291A7-DDA8-4E90-9A0D-D4CFC8CEA93C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:axis:axis_os_2018:*:*:*:*:lts:*:*:*\",\"versionEndExcluding\":\"8.40.4.3\",\"matchCriteriaId\":\"7DBF5FEA-1BE8-4A00-8195-028D38A9930F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:axis:axis_os_2020:*:*:*:*:lts:*:*:*\",\"versionEndExcluding\":\"9.80.3.5\",\"matchCriteriaId\":\"33DFA815-B675-470B-8BD2-63326E700EF8\"}]}]}],\"references\":[{\"url\":\"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf\",\"source\":\"product-security@axis.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:05:12+00:00",
      "cve": "CVE-2021-31987",
      "id": "CVE-2021-31987",
      "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-2021-31987",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31987.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…

Detection rules are retrieved from Rulezet.

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…