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CVE-2024-27305

17
FAUCET Score

CVE-2024-27305 is an SMTP smuggling vulnerability affecting aiosmtpd, a Python-based SMTP server. This flaw allows attackers to send spoofed emails with fake sender addresses, facilitating advanced phishing attacks. Rated Medium severity (CVSS 5.3), it requires no authentication or user interaction, but its impact is limited to integrity (spoofing). There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.5CPE matchmatch criteria
cpe:2.3:a:aio-libs:aiosmtpd:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 18th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: aiosmtpdFixed in: 1.4.5

Vendor Advisories (1)

pipGHSA-pr2m-px7j-xg65medium

aiosmtpd vulnerable to SMTP smuggling

Mar 13, 2024

References

github.com / aio-libs/aiosmtpd/commit/24b6c79c8921cf1800e27ca144f4f37023982bbb
Patch
github.com / aio-libs/aiosmtpd/security/advisories/GHSA-pr2m-px7j-xg65
Vendor Advisory
postfix.org / smtp-smuggling.html
Product