CVE-2021-1405Network attack vector

Scanning-process crash via mail parser NULL dereference

Published Apr 8, 2021 · Updated Nov 8, 2024

Denial of service in Cisco ClamAV 0.103.1 and earlier allows remote attackers to crash the scanning process with a crafted email. The email parser leaves a variable improperly initialized and then performs a NULL-pointer read while processing the crafted message. No authentication or user interaction is required; the resulting process crash interrupts antivirus scanning.

CVSS severity7.5
High
EPSS probability3.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco ClamAV 0.103.1 and earlier allows remote attackers to crash the scanning process with a crafted email. The email parser leaves a variable improperly initialized and then performs a NULL-pointer read while processing the crafted message. No authentication or user interaction is required; the resulting process crash interrupts antivirus scanning.

The record

CVE
CVE-2021-1405
Published
Apr 8, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
ClamAV
Classifications
CWE-909, CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=0.103.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · ClamAVversion=unspecified <=0.103.1

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-909Missing Initialization of Resource
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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