Vulnerability-Lookup

FKIE_CVE-2021-31987

Vulnerability from fkie_nvd - Published: 2021-10-05 22:15 - Updated: 2026-06-17 03:52

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.

References

	URL	Tags
	product-security@axis.com	https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf	Vendor Advisory

Impacted products

Vendor	Product	Version
axis	axis_os	*
axis	axis_os_2016	*
axis	axis_os_2018	*
axis	axis_os_2020	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "AXIS OS",
          "vendor": "Axis Communications AB",
          "versions": [
            {
              "status": "affected",
              "version": "AXIS OS 5.51 or later"
            }
          ]
        }
      ],
      "source": "product-security@axis.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:axis:axis_os:*:*:*:*:active:*:*:*",
              "matchCriteriaId": "F267E473-FA9F-4C5D-8BFE-D195372303DC",
              "versionEndExcluding": "10.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:axis:axis_os_2016:*:*:*:*:lts:*:*:*",
              "matchCriteriaId": "E99291A7-DDA8-4E90-9A0D-D4CFC8CEA93C",
              "versionEndExcluding": "6.50.5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:axis:axis_os_2018:*:*:*:*:lts:*:*:*",
              "matchCriteriaId": "7DBF5FEA-1BE8-4A00-8195-028D38A9930F",
              "versionEndExcluding": "8.40.4.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:axis:axis_os_2020:*:*:*:*:lts:*:*:*",
              "matchCriteriaId": "33DFA815-B675-470B-8BD2-63326E700EF8",
              "versionEndExcluding": "9.80.3.5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "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"
    }
  ],
  "id": "CVE-2021-31987",
  "lastModified": "2026-06-17T03:52:38.407",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.1,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 4.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-10-05T22:15:07.887",
  "references": [
    {
      "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"
      ],
      "url": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf"
    }
  ],
  "sourceIdentifier": "product-security@axis.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1286"
        }
      ],
      "source": "product-security@axis.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2021-10-05 21:46 – Updated: 2024-11-08 08:20

Summary

A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.

Severity

No CVSS data available.

CWE

CWE-1286 - Improper Validation of Syntactic Correctness of Input

Assigner

Axis mitre root

References

1 reference

URL	Tags
https://www.axis.com/files/tech_notes/CVE-2021-31…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Axis Communications AB	AXIS OS	Affected: AXIS OS 5.51 or later

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:10:31.317Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "tags": [
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              "x_transferred"
            ],
            "url": "https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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        {
          "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"
            }
          ],
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        }
      ],
      "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"
                          }
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                },
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        },
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                  "value": "Improper input validation"
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        },
        "references": {
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            }
          ]
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "f2daf9a0-02c2-4b83-a01d-63b3b304b807",
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}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.