Vulnerability-Lookup

PYSEC-2026-1111

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:23

Details

Summary

Servers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a MitM attack.

References

NO STARTTLS: Similar vulnerabilities discovered by previous researchers.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Impacted products

Name	purl
aiosmtpd	pkg:pypi/aiosmtpd

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "aiosmtpd",
        "purl": "pkg:pypi/aiosmtpd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0",
        "1.0a1",
        "1.0a2",
        "1.0a3",
        "1.0a4",
        "1.0a5",
        "1.0b1",
        "1.0rc1",
        "1.1",
        "1.2",
        "1.2.2",
        "1.2.4",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.4.0",
        "1.4.1",
        "1.4.2",
        "1.4.3",
        "1.4.3rc1",
        "1.4.3rc2",
        "1.4.4",
        "1.4.4.post1",
        "1.4.4.post2",
        "1.4.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-34083",
    "GHSA-wgjv-9j3q-jhg8"
  ],
  "details": "### Summary\nServers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a MitM attack.\n\n### References\n* [NO STARTTLS: Similar vulnerabilities discovered by previous researchers.](https://nostarttls.secvuln.info/)",
  "id": "PYSEC-2026-1111",
  "modified": "2026-07-07T17:23:38.150447Z",
  "published": "2026-07-07T11:45:42.819390Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-34083"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiosmtpd"
    },
    {
      "type": "WEB",
      "url": "https://nostarttls.secvuln.info"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/aiosmtpd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wgjv-9j3q-jhg8"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "aiosmtpd STARTTLS unencrypted commands injection"
}

CVE-2024-34083 (GCVE-0-2024-34083)

Vulnerability from cvelistv5 – Published: 2024-05-18 18:12 – Updated: 2024-08-02 02:42

Title

STARTTLS unencrypted commands injection

Summary

aiosmptd is a reimplementation of the Python stdlib smtpd.py based on asyncio. Prior to version 1.4.6, servers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a man-in-the-middle attack. Version 1.4.6 contains a patch for the issue.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/aio-libs/aiosmtpd/security/adv…	x_refsource_CONFIRM
https://github.com/aio-libs/aiosmtpd/commit/b3a4a…	x_refsource_MISC
https://nostarttls.secvuln.info	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
aio-libs	aiosmtpd	Affected: < 1.4.6
aio-libs	aiosmtpd	Affected: 0 , < 1.4.6 (custom) cpe:2.3:a:aio-libs:aiosmtpd::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:aio-libs:aiosmtpd:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "aiosmtpd",
            "vendor": "aio-libs",
            "versions": [
              {
                "lessThan": "1.4.6",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-34083",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T19:53:50.439283Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:42:19.001Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T02:42:59.884Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8"
          },
          {
            "name": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda"
          },
          {
            "name": "https://nostarttls.secvuln.info",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://nostarttls.secvuln.info"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "aiosmtpd",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.4.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "aiosmptd is  a reimplementation of the Python stdlib smtpd.py based on asyncio. Prior to version 1.4.6, servers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a man-in-the-middle attack. Version 1.4.6 contains a patch for the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-349",
              "description": "CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-18T18:12:19.442Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8"
        },
        {
          "name": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda"
        },
        {
          "name": "https://nostarttls.secvuln.info",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://nostarttls.secvuln.info"
        }
      ],
      "source": {
        "advisory": "GHSA-wgjv-9j3q-jhg8",
        "discovery": "UNKNOWN"
      },
      "title": "STARTTLS unencrypted commands injection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-34083",
    "datePublished": "2024-05-18T18:12:19.442Z",
    "dateReserved": "2024-04-30T06:56:33.384Z",
    "dateUpdated": "2024-08-02T02:42:59.884Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

GHSA-WGJV-9J3Q-JHG8

Vulnerability from github – Published: 2024-05-20 14:59 – Updated: 2026-06-10 13:41

Summary

aiosmtpd STARTTLS unencrypted commands injection

Details

Summary

Servers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a MitM attack.

References

NO STARTTLS: Similar vulnerabilities discovered by previous researchers.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "aiosmtpd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-34083"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-349"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-05-20T14:59:07Z",
    "nvd_published_at": "2024-05-18T19:15:49Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nServers based on aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. This could be exploited by a MitM attack.\n\n### References\n* [NO STARTTLS: Similar vulnerabilities discovered by previous researchers.](https://nostarttls.secvuln.info/)",
  "id": "GHSA-wgjv-9j3q-jhg8",
  "modified": "2026-06-10T13:41:53Z",
  "published": "2024-05-20T14:59:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-34083"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiosmtpd"
    },
    {
      "type": "WEB",
      "url": "https://nostarttls.secvuln.info"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "aiosmtpd STARTTLS unencrypted commands injection"
}

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.

Action not permitted

PYSEC-2026-1111

Summary

References

CVE-2024-34083 (GCVE-0-2024-34083)

GHSA-WGJV-9J3Q-JHG8

Summary

References

Tags

Sightings

Nomenclature