How severe is CVE-2024-27305?

CVE-2024-27305 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2024-27305 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-27305?

CVE-2024-27305 affects Aio-libs Aiosmtpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-27305?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-27305 have an EU (EUVD) identifier?

Yes. CVE-2024-27305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0215.

When was CVE-2024-27305 published?

CVE-2024-27305 was published on 2024-03-12 and last updated on 2026-06-17.

CVE-2024-27305

CVE-2024-27305 is a medium-severity vulnerability in Aio-libs Aiosmtpd with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0215
Weakness: CWE-345
Affected product: Aio-libs Aiosmtpd
Published: 2024-03-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-27305?: 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.
How severe is CVE-2024-27305?: CVE-2024-27305 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2024-27305 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-27305?: CVE-2024-27305 affects Aio-libs Aiosmtpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-27305?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-27305 have an EU (EUVD) identifier?: Yes. CVE-2024-27305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0215.
When was CVE-2024-27305 published?: CVE-2024-27305 was published on 2024-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:aio-libs:aiosmtpd:*:*:*:*:*:*:*:*

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