CVE-2020-3341Network attack vector

Scanning process crash via undersized AES buffer

Published May 13, 2020 · Updated Nov 15, 2024

Out-of-bounds read in Cisco ClamAV 0.101 through 0.102.2 allows remote attackers to crash the scanner with a crafted PDF file. The PDF parser fails to validate the size of a buffer before passing it to AES decryption initialization, causing a stack-buffer over-read. Exploitation requires the target to scan the supplied PDF and interrupts only the affected ClamAV scanning process.

CVSS severity7.5
High
EPSS probability3.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Cisco ClamAV 0.101 through 0.102.2 allows remote attackers to crash the scanner with a crafted PDF file. The PDF parser fails to validate the size of a buffer before passing it to AES decryption initialization, causing a stack-buffer over-read. Exploitation requires the target to scan the supplied PDF and interrupts only the affected ClamAV scanning process.

The record

CVE
CVE-2020-3341
Published
May 13, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
ClamAV
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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 <0.102.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · ClamAVversion=unspecified <0.102.3

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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