CVE-2021-20617 (GCVE-0-2021-20617)

Vulnerability from cvelistv5 – Published: 2021-01-14 08:20 – Updated: 2024-08-03 17:45
VLAI Shadowserver
Summary
Improper access control vulnerability in acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier allows remote attackers to execute an arbitrary OS command, or gain an administrative privilege which may result in obtaining the sensitive information on the server via unspecified vectors.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • Improper access control
Assigner
jpcert CNA under the jpcert root
CNA scorecard C 64/100 over 186 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Seeds Co.,Ltd. acmailer and acmailer DB Affected: acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier
guessed Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d71e3608-1695-4a33-8504-689c26c4b131

Vulnerability ID: CVE-2021-20617

Status: Confirmed

Status Updated: 2026-09-06 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2024-12-05
Asserted: 2024-12-05
Last Seen: 2026-09-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: acmailer / acmailer | Class: email | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-09-06: 55
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 3
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class email
7D Avg 2
Vendor acmailer
30D Avg 1
90D Avg 1
Product acmailer
Cisa Kev no
Connections 55
Observation Date 2026-09-06
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-07-01 07:18 UTC | Updated: 2026-09-08 01:00 UTC
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:45:44.798Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.acmailer.jp/info/de.cgi?id=101"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://jvn.jp/en/jp/JVN35906450/index.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "acmailer and acmailer DB",
          "vendor": "Seeds Co.,Ltd.",
          "versions": [
            {
              "status": "affected",
              "version": "acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Improper access control vulnerability in acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier allows remote attackers to execute an arbitrary OS command, or gain an administrative privilege which may result in obtaining the sensitive information on the server via unspecified vectors."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Improper access control",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-01-14T08:20:16.000Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.acmailer.jp/info/de.cgi?id=101"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://jvn.jp/en/jp/JVN35906450/index.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "vultures@jpcert.or.jp",
          "ID": "CVE-2021-20617",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "acmailer and acmailer DB",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Seeds Co.,Ltd."
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Improper access control vulnerability in acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier allows remote attackers to execute an arbitrary OS command, or gain an administrative privilege which may result in obtaining the sensitive information on the server via unspecified vectors."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Improper access control"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.acmailer.jp/info/de.cgi?id=101",
              "refsource": "MISC",
              "url": "https://www.acmailer.jp/info/de.cgi?id=101"
            },
            {
              "name": "https://jvn.jp/en/jp/JVN35906450/index.html",
              "refsource": "MISC",
              "url": "https://jvn.jp/en/jp/JVN35906450/index.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2021-20617",
    "datePublished": "2021-01-14T08:20:16.000Z",
    "dateReserved": "2020-12-17T00:00:00.000Z",
    "dateUpdated": "2024-08-03T17:45:44.798Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-20617",
      "date": "2026-10-14",
      "epss": "0.07413",
      "percentile": "0.94356"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:acmailer:acmailer:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D103A485-F353-4EFB-A9B8-A6AB0347DB8D",
                    "versionEndIncluding": "4.0.1",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:acmailer:acmailer_db:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0A6A96DA-719B-44EC-81E9-9CAF9A5C410F",
                    "versionEndIncluding": "1.1.3",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Improper access control vulnerability in acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier allows remote attackers to execute an arbitrary OS command, or gain an administrative privilege which may result in obtaining the sensitive information on the server via unspecified vectors."
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad de control de acceso inapropiado en acmailer versiones ver.\u0026#xa0;4.0.1 y anteriores, y acmailer DB versiones ver.\u0026#xa0;1.1.3 y anteriores, permiten a atacantes remotos ejecutar un comando arbitrario del Sistema Operativo y alcanzar un privilegio administrativo que puede resultar en la obtenci\u00f3n de informaci\u00f3n confidencial en el servidor por medio de vectores no especificados"
          }
        ],
        "id": "CVE-2021-20617",
        "lastModified": "2024-11-21T05:46:53.193",
        "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": "2021-01-14T09:15:13.367",
        "references": [
          {
            "source": "vultures@jpcert.or.jp",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://jvn.jp/en/jp/JVN35906450/index.html"
          },
          {
            "source": "vultures@jpcert.or.jp",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://www.acmailer.jp/info/de.cgi?id=101"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://jvn.jp/en/jp/JVN35906450/index.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://www.acmailer.jp/info/de.cgi?id=101"
          }
        ],
        "sourceIdentifier": "vultures@jpcert.or.jp",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-Other"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-27T15:01:23+00:00",
      "cve": "CVE-2021-20617",
      "id": "CVE-2021-20617",
      "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-2021-20617",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20617.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.