5.3

CVE-2024-27305: aio-libs aiosmtpd

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-pr2m-px7j-xg65PYSEC-2024-221UBUNTU-CVE-2024-27305
Published 12-03-2024Last modified 02-08-2024
Open JSON

Vulnerability summary

CVE-2024-27305 is a medium (CVSS 5.3) vulnerability in aio-libs aiosmtpd. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2024:0243-1OPENSUSE-SU-2026:11675-1

Timeline

  1. 12-03-2024
    PublishedVulnerability first disclosed.
  2. 02-08-2024
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

0.00 pp

From 0.37% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Aio-libs1 product
Debian1 product
  • python-aiosmtpd< 1.4.3-1.1+deb12u1 | < 1.4.6-1
PyPI1 product
  • aiosmtpd< 24b6c79c8921cf1800e27ca144f4f37023982bbb | < 1.4.5
Ubuntu1 product
  • python-aiosmtpdAll versions (No fix recorded)

4 vendors · 4 products

References

10 links