TI-2024-22540 Aliases CVE-2024-34083 GHSA-wgjv-9j3q-jhg8

STARTTLS unencrypted commands injection

LOW 24CWE-349Published 2024-05-18 · Updated 2024-08-02

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00228 13th percentileScored 2026-11-07

Fix Fixed aiosmtpd (aio-libs): 1.4.6aiosmtpd (PyPI): 1.4.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
aio-libs	aiosmtpd	before 1.4.6	1.4.6	Patch available	CNA
—	aiosmtpd (PyPI)	before 1.4.6	1.4.6	Patch available	GHSA-wgjv-9j3q-jhg8

aiosmtpd Vendoraio-libs Affected before 1.4.6 Fixed in 1.4.6 Patch available CNA
aiosmtpd (PyPI) Vendor— Affected before 1.4.6 Fixed in 1.4.6 Patch available GHSA-wgjv-9j3q-jhg8

CPE names CISA-ADP · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:aio-libs:aiosmtpd::::::::	—	—	aio-libs

cpe:2.3:a:aio-libs:aiosmtpd:*:*:*:*:*:*:*:* Versions — — ·aio-libs

Remediation

Fix · CNA aiosmtpd (aio-libs) Fixed in 1.4.6
Fix · GHSA-wgjv-9j3q-jhg8 aiosmtpd (PyPI) Fixed in 1.4.6 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2024-34083
2026-10-03 Alias added: GHSA-wgjv-9j3q-jhg8

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-34083

Other 4

TI-2025-38826 aiomysql allows arbitrary access to client files through vulnerability of a malicious MySQL server CVSS 4.0HIGH 8.2
TI-2024-15436 aiohttp.web.static(follow_symlinks=True) is vulnerable to directory traversal CVSS 3.1HIGH 7.5
TI-2023-25769 Request smuggling in aiohttp CVSS 3.1HIGH 7.5
TI-2023-18906 aiohttp vulnerable to HTTP request smuggling CVSS 3.1HIGH 7.5
TI-2023-26746 aiohttp's ClientSession is vulnerable to CRLF injection via version CVSS 3.1HIGH 7.2
TI-2026-66145 Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction CVSS 3.1MEDIUM 5.3

See all 59 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences