{"cve":"CVE-2024-34083","nvd":{"published":"2024-05-18T19:15:49.190","modified":"2026-06-17T07:32:52.340","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":5.4},"cwes":["CWE-349"],"references":["https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda","https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8","https://nostarttls.secvuln.info","https://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda","https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2024-34083","score":0.00228,"percentile":0.13596,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wgjv-9j3q-jhg8","url":"https://osv.dev/vulnerability/GHSA-wgjv-9j3q-jhg8","summary":"aiosmtpd STARTTLS unencrypted commands injection","modified":"2026-07-07T17:56:11.074488278Z","packages":[{"ecosystem":"PyPI","name":"aiosmtpd","purl":"pkg:pypi/aiosmtpd","ranges":["<1.4.6"],"fixed":["1.4.6"]}]},{"id":"PYSEC-2026-1111","url":"https://osv.dev/vulnerability/PYSEC-2026-1111","summary":"aiosmtpd STARTTLS unencrypted commands injection","modified":"2026-07-07T17:46:10.952069511Z","packages":[{"ecosystem":"PyPI","name":"aiosmtpd","purl":"pkg:pypi/aiosmtpd","ranges":["<1.4.6"],"fixed":["1.4.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}