{"cve":"CVE-2024-27305","nvd":{"published":"2024-03-12T21:15:58.630","modified":"2026-06-17T07:19:36.810","status":"Analyzed","description":"aiosmtpd is a reimplementation of the Python stdlib smtpd.py based on asyncio. aiosmtpd is vulnerable to inbound SMTP smuggling. SMTP smuggling is a novel vulnerability based on not so novel interpretation differences of the SMTP protocol. By exploiting SMTP smuggling, an attacker may send smuggle/spoof e-mails with fake sender addresses, allowing advanced phishing attacks. This issue is also existed in other SMTP software like Postfix. With the right SMTP server constellation, an attacker can send spoofed e-mails to inbound/receiving aiosmtpd instances. This issue has been addressed in version 1.4.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-345"],"references":["https://github.com/aio-libs/aiosmtpd/commit/24b6c79c8921cf1800e27ca144f4f37023982bbb","https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-pr2m-px7j-xg65","https://www.postfix.org/smtp-smuggling.html","https://github.com/aio-libs/aiosmtpd/commit/24b6c79c8921cf1800e27ca144f4f37023982bbb","https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-pr2m-px7j-xg65"],"products":["aio-libs:aiosmtpd"],"source":"nvd","synced_at":"2026-10-19T21:46:54.846886191+00:00"},"epss":{"cve":"CVE-2024-27305","score":0.00374,"percentile":0.31384,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-pr2m-px7j-xg65","url":"https://osv.dev/vulnerability/GHSA-pr2m-px7j-xg65","summary":"aiosmtpd vulnerable to SMTP smuggling","modified":"2026-06-10T17:14:17.820156268Z","packages":[{"ecosystem":"PyPI","name":"aiosmtpd","purl":"pkg:pypi/aiosmtpd","ranges":["<1.4.5"],"fixed":["1.4.5"]}]},{"id":"PYSEC-2024-221","url":"https://osv.dev/vulnerability/PYSEC-2024-221","summary":"","modified":"2026-06-10T17:14:17.101220621Z","packages":[{"ecosystem":"PyPI","name":"aiosmtpd","purl":"pkg:pypi/aiosmtpd","ranges":["<1.4.5"],"fixed":["1.4.5"]}]}],"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."]}