CVE-2024-28054Public exploitNetwork attack vector

Malware-check bypass via conflicting MIME boundaries

Published Mar 18, 2024 · Updated Nov 4, 2025

Interpretation conflict in Amavis before 2.12.3 and 2.13.x before 2.13.1 allows remote attackers to bypass malware checks via email. MIME::Parser selects the last of conflicting boundary parameters, while affected mail clients select the first, so Amavis scans different MIME parts. An unauthenticated sender can therefore deliver a banned or malicious attachment that reaches the recipient without an Amavis warning or block.

CVSS severity7.4
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Interpretation conflict in Amavis before 2.12.3 and 2.13.x before 2.13.1 allows remote attackers to bypass malware checks via email. MIME::Parser selects the last of conflicting boundary parameters, while affected mail clients select the first, so Amavis scans different MIME parts. An unauthenticated sender can therefore deliver a banned or malicious attachment that reaches the recipient without an Amavis warning or block.

The record

CVE
CVE-2024-28054
Published
Mar 18, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-436, T1566.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-436Interpretation Conflict
T1566.001Spearphishing Attachment

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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