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Security Advisories: GSA_kwCzR0hTQS1wcjJtLXB4N2oteGc2Nc4AA584

aiosmtpd vulnerable to SMTP smuggling


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 also existed in other SMTP software like Postfix (


Detailed information on SMTP smuggling can be found in the full blog post ( or on the Postfix homepage ( (and soon on the official website


With the right SMTP server constellation, an attacker can send spoofed e-mails to inbound/receiving aiosmtpd instances.

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 2 months ago
Updated: 2 months ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Identifiers: GHSA-pr2m-px7j-xg65, CVE-2024-27305
References: Repository:
Blast Radius: 13.2

Affected Packages

Dependent packages: 24
Dependent repositories: 310
Downloads: 189,994 last month
Affected Version Ranges: < 1.4.5
Fixed in: 1.4.5
All affected versions: 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, 1.4.4
All unaffected versions: 1.4.5, 1.4.6