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CVE-2024-20380

ClamAV HTML Parser Denial of Service Vulnerability

7.5 HighFix available

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.10%Up 1.1 points since Apr 19, 2024
90%50%10%1%

What each source reports

CVE List Score used 7.5

ClamAV HTML Parser Denial of Service Vulnerability

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Record
CVE-2024-20380
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-475
Updated
2026-11-02
EUVDEUVD-2024-18095 7.5

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Record
EUVD-2024-18095
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-m2rv-2ggp-66m7 7.5

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to...

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Record
GHSA-m2rv-2ggp-66m7
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-475
Updated
2026-11-02
NVD 7.5

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Record
CVE-2024-20380
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-475
Updated
2026-11-02
OSV 7.5

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Record
CVE-2024-20380
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:14087-1 No score

clamav-1.3.1-1.1 on GA media

These are all security issues fixed in the clamav-1.3.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:14087-1
Updated
2026-11-02
OSVSUSE-SU-2025:0325-1 No score

Security update for clamav

This update for clamav fixes the following issues:

New version 1.4.2:

  • CVE-2025-20128, bsc#1236307: Fixed a possible buffer overflow read bug in the OLE2 file parser that could cause a denial-of-service (DoS) condition.
  • Start clamonacc with --fdpass to avoid errors due to clamd not being able to access user files. (bsc#1232242)

  • New version 1.4.1:

  • New version 1.4.0:

    • Added support for extracting ALZ archives.
    • Added support for extracting LHA/LZH archives.
    • Added the ability to disable image fuzzy hashing, if needed. For context, image fuzzy hashing is a detection mechanism useful for identifying malware by matching images included with the malware or phishing email/document.
    • https://blog.clamav.net/2024/08/clamav-140-feature-release-and-clamav.html
  • New version 1.3.2:

    • CVE-2024-20506: Changed the logging module to disable following symlinks on Linux and Unix systems so as to prevent an attacker with existing access to the 'clamd' or 'freshclam' services from using a symlink to corrupt system files.
    • CVE-2024-20505: Fixed a possible out-of-bounds read bug in the PDF file parser that could cause a denial-of-service condition.
    • Removed unused Python modules from freshclam tests including deprecated 'cgi' module that is expected to cause test failures in Python 3.13.
    • Fix unit test caused by expiring signing certificate.
    • Fixed a build issue on Windows with newer versions of Rust. Also upgraded GitHub Actions imports to fix CI failures.
    • Fixed an unaligned pointer dereference issue on select architectures.
    • Fixes to Jenkins CI pipeline.
  • New Version: 1.3.1:

    • CVE-2024-20380: Fixed a possible crash in the HTML file parser that could cause a denial-of-service (DoS) condition.
    • Updated select Rust dependencies to the latest versions.
    • Fixed a bug causing some text to be truncated when converting from UTF-16.
    • Fixed assorted complaints identified by Coverity static analysis.
    • Fixed a bug causing CVDs downloaded by the DatabaseCustomURL
    • Added the new 'valhalla' database name to the list of optional databases in preparation for future work.
  • New version: 1.3.0:

    • Added support for extracting and scanning attachments found in Microsoft OneNote section files. OneNote parsing will be enabled by default, but may be optionally disabled.
    • Added file type recognition for compiled Python ('.pyc') files.
    • Improved support for decrypting PDFs with empty passwords.
    • Fixed a warning when scanning some HTML files.
    • ClamOnAcc: Fixed an infinite loop when a watched directory does not exist.
    • ClamOnAcc: Fixed an infinite loop when a file has been deleted before a scan.
  • New version: 1.2.0:

    • Added support for extracting Universal Disk Format (UDF) partitions.
    • Added an option to customize the size of ClamAV's clean file cache.
    • Raised the MaxScanSize limit so the total amount of data scanned when scanning a file or archive may exceed 4 gigabytes.
    • Added ability for Freshclam to use a client certificate PEM file and a private key PEM file for authentication to a private mirror.
    • Fix an issue extracting files from ISO9660 partitions where the files are listed in the plain ISO tree and there also exists an empty Joliet tree.
    • PID and socket are now located under /run/clamav/clamd.pid and /run/clamav/clamd.sock .
    • bsc#1211594: Fixed an issue where ClamAV does not abort the signature load process after partially loading an invalid signature.
  • New version 1.1.0:

Record
SUSE-SU-2025:0325-1
Updated
2026-11-02
OSVSUSE-SU-2025:0327-1 No score

Security update for clamav

This update for clamav fixes the following issues:

New version 1.4.2:

  • CVE-2025-20128, bsc#1236307: Fixed a possible buffer overflow read bug in the OLE2 file parser that could cause a denial-of-service (DoS) condition.
  • Start clamonacc with --fdpass to avoid errors due to clamd not being able to access user files. (bsc#1232242)

  • New version 1.4.1:

  • New version 1.4.0:

    • Added support for extracting ALZ archives.
    • Added support for extracting LHA/LZH archives.
    • Added the ability to disable image fuzzy hashing, if needed. For context, image fuzzy hashing is a detection mechanism useful for identifying malware by matching images included with the malware or phishing email/document.
    • https://blog.clamav.net/2024/08/clamav-140-feature-release-and-clamav.html
  • New version 1.3.2:

    • CVE-2024-20506: Changed the logging module to disable following symlinks on Linux and Unix systems so as to prevent an attacker with existing access to the 'clamd' or 'freshclam' services from using a symlink to corrupt system files.
    • CVE-2024-20505: Fixed a possible out-of-bounds read bug in the PDF file parser that could cause a denial-of-service condition.
    • Removed unused Python modules from freshclam tests including deprecated 'cgi' module that is expected to cause test failures in Python 3.13.
    • Fix unit test caused by expiring signing certificate.
    • Fixed a build issue on Windows with newer versions of Rust. Also upgraded GitHub Actions imports to fix CI failures.
    • Fixed an unaligned pointer dereference issue on select architectures.
    • Fixes to Jenkins CI pipeline.
  • New Version: 1.3.1:

    • CVE-2024-20380: Fixed a possible crash in the HTML file parser that could cause a denial-of-service (DoS) condition.
    • Updated select Rust dependencies to the latest versions.
    • Fixed a bug causing some text to be truncated when converting from UTF-16.
    • Fixed assorted complaints identified by Coverity static analysis.
    • Fixed a bug causing CVDs downloaded by the DatabaseCustomURL
    • Added the new 'valhalla' database name to the list of optional databases in preparation for future work.
  • New version: 1.3.0:

    • Added support for extracting and scanning attachments found in Microsoft OneNote section files. OneNote parsing will be enabled by default, but may be optionally disabled.
    • Added file type recognition for compiled Python ('.pyc') files.
    • Improved support for decrypting PDFs with empty passwords.
    • Fixed a warning when scanning some HTML files.
    • ClamOnAcc: Fixed an infinite loop when a watched directory does not exist.
    • ClamOnAcc: Fixed an infinite loop when a file has been deleted before a scan.
  • New version: 1.2.0:

    • Added support for extracting Universal Disk Format (UDF) partitions.
    • Added an option to customize the size of ClamAV's clean file cache.
    • Raised the MaxScanSize limit so the total amount of data scanned when scanning a file or archive may exceed 4 gigabytes.
    • Added ability for Freshclam to use a client certificate PEM file and a private key PEM file for authentication to a private mirror.
    • Fix an issue extracting files from ISO9660 partitions where the files are listed in the plain ISO tree and there also exists an empty Joliet tree.
    • PID and socket are now located under /run/clamav/clamd.pid and /run/clamav/clamd.sock .
    • bsc#1211594: Fixed an issue where ClamAV does not abort the signature load process after partially loading an invalid signature.
  • New version 1.1.0:

Record
SUSE-SU-2025:0327-1
Updated
2026-11-02
OSVSUSE-SU-2025:0328-1 No score

Security update for clamav

This update for clamav fixes the following issues:

New version 1.4.2:

  • CVE-2025-20128, bsc#1236307: Fixed a possible buffer overflow read bug in the OLE2 file parser that could cause a denial-of-service (DoS) condition.
  • Start clamonacc with --fdpass to avoid errors due to clamd not being able to access user files. (bsc#1232242)

  • New version 1.4.1:

  • New version 1.4.0:

    • Added support for extracting ALZ archives.
    • Added support for extracting LHA/LZH archives.
    • Added the ability to disable image fuzzy hashing, if needed. For context, image fuzzy hashing is a detection mechanism useful for identifying malware by matching images included with the malware or phishing email/document.
    • https://blog.clamav.net/2024/08/clamav-140-feature-release-and-clamav.html
  • New version 1.3.2:

    • CVE-2024-20506: Changed the logging module to disable following symlinks on Linux and Unix systems so as to prevent an attacker with existing access to the 'clamd' or 'freshclam' services from using a symlink to corrupt system files.
    • CVE-2024-20505: Fixed a possible out-of-bounds read bug in the PDF file parser that could cause a denial-of-service condition.
    • Removed unused Python modules from freshclam tests including deprecated 'cgi' module that is expected to cause test failures in Python 3.13.
    • Fix unit test caused by expiring signing certificate.
    • Fixed a build issue on Windows with newer versions of Rust. Also upgraded GitHub Actions imports to fix CI failures.
    • Fixed an unaligned pointer dereference issue on select architectures.
    • Fixes to Jenkins CI pipeline.
  • New Version: 1.3.1:

    • CVE-2024-20380: Fixed a possible crash in the HTML file parser that could cause a denial-of-service (DoS) condition.
    • Updated select Rust dependencies to the latest versions.
    • Fixed a bug causing some text to be truncated when converting from UTF-16.
    • Fixed assorted complaints identified by Coverity static analysis.
    • Fixed a bug causing CVDs downloaded by the DatabaseCustomURL
    • Added the new 'valhalla' database name to the list of optional databases in preparation for future work.
  • New version: 1.3.0:

    • Added support for extracting and scanning attachments found in Microsoft OneNote section files. OneNote parsing will be enabled by default, but may be optionally disabled.
    • Added file type recognition for compiled Python ('.pyc') files.
    • Improved support for decrypting PDFs with empty passwords.
    • Fixed a warning when scanning some HTML files.
    • ClamOnAcc: Fixed an infinite loop when a watched directory does not exist.
    • ClamOnAcc: Fixed an infinite loop when a file has been deleted before a scan.
  • New version: 1.2.0:

    • Added support for extracting Universal Disk Format (UDF) partitions.
    • Added an option to customize the size of ClamAV's clean file cache.
    • Raised the MaxScanSize limit so the total amount of data scanned when scanning a file or archive may exceed 4 gigabytes.
    • Added ability for Freshclam to use a client certificate PEM file and a private key PEM file for authentication to a private mirror.
    • Fix an issue extracting files from ISO9660 partitions where the files are listed in the plain ISO tree and there also exists an empty Joliet tree.
    • PID and socket are now located under /run/clamav/clamd.pid and /run/clamav/clamd.sock .
    • bsc#1211594: Fixed an issue where ClamAV does not abort the signature load process after partially loading an invalid signature.
  • New version 1.1.0:

Record
SUSE-SU-2025:0328-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
clamav
SUSE:Linux Enterprise Micro 5.5
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Server 15 SP3-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Server for SAP Applications 15 SP3
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
Show 10 moreShow less
Affected packages
PackageAffectedFixed
clamav
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Manager Proxy 4.3
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Manager Server 4.3
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Enterprise Storage 7.1
From an advisory covering 6 CVEs
before 1.4.2-150200.8.3.1
1.4.2-150200.8.3.1
clamav
SUSE:Linux Enterprise Module for Basesystem 15 SP6
From an advisory covering 6 CVEs
before 1.4.2-150600.18.6.1
1.4.2-150600.18.6.1
clamav
openSUSE:Leap 15.6
From an advisory covering 6 CVEs
before 1.4.2-150600.18.6.1
1.4.2-150600.18.6.1
clamav
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 6 CVEs
before 1.4.2-3.36.1
1.4.2-3.36.1
clamav
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 6 CVEs
before 1.4.2-3.36.1
1.4.2-3.36.1
clamav
openSUSE:Tumbleweed
before 1.3.1-1.1
1.3.1-1.1

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-20380 is a high vulnerability (CVSS 7.5) in Cisco Clamav, published April 18, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.10%, the 65th percentile. Fixed in clamav 1.3.1-1.1.

References

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Left out here: the rest of 3 source descriptions. The JSON record has them.

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