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Fencer Vulns
medium 5.4

CVE-2024-34083 json

STARTTLS unencrypted commands injection

published 2024-05-18 2 y ago modified 2026-07-07 4 mo ago also EUVD-2024-1830 , GHSA-wgjv-9j3q-jhg8 , PYSEC-2026-1111

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

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.

Patch / fix

  • pypi aiosmtpd 1.4.6
  • aio-libs aiosmtpd 1.4.6
  • python-aiosmtpd Debian 12 1.4.3-1.1+deb12u1
  • python-aiosmtpd Debian 14, Debian 13 1.4.6-1

debian advisories DEBIAN-CVE-2024-34083

  • python-aiosmtpd openSUSE Tumbleweed 1.4.6-6.1
  • python-aiosmtpd Package Hub 15 SP5, openSUSE Leap 15.5 1.2.1-bp155.3.3.1

opensuse advisories openSUSE-SU-2026:11675-1openSUSE-SU-2024:0243-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-34083 updated cvss 5.4

aiosmtpd: servers based on aiosmtpd accept extra unencrypted commands

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi aiosmtpd
<1.4.6
1.4.6

Affected products

  • aio-libs aiosmtpd

Classification

Weakness
  • CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.