CVE-2024-20380
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.
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
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 High
CVSS: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 High
CVSS: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 High
CVSS: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 High
CVSS: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 High
CVSS: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:
- https://blog.clamav.net/2023/05/clamav-110-released.html
- Added the ability to extract images embedded in HTML CSS
<style> blocks.
- Updated to Sigtool so that the '--vba' option will extract VBA code from Microsoft Office documents the same way that …
- 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:
- https://blog.clamav.net/2023/05/clamav-110-released.html
- Added the ability to extract images embedded in HTML CSS
<style> blocks.
- Updated to Sigtool so that the '--vba' option will extract VBA code from Microsoft Office documents the same way that …
- 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:
- https://blog.clamav.net/2023/05/clamav-110-released.html
- Added the ability to extract images embedded in HTML CSS
<style> blocks.
- Updated to Sigtool so that the '--vba' option will extract VBA code from Microsoft Office documents the same way that …
- Record
SUSE-SU-2025:0328-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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
| Package | Affected | Fixed |
|---|---|---|
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavopenSUSE:Leap 15.6 From an advisory covering 6 CVEs |
before 1.4.2-150600.18.6.1 | 1.4.2-150600.18.6.1 |
clamavSUSE: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 |
clamavSUSE: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 |
clamavopenSUSE:Tumbleweed |
before 1.3.1-1.1 | 1.3.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases, published | EUVD | |
| first indexed | CVE 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
blog.clamav.net/2024/04/clamav-131-123-106-patch-versions.html
nvd.nist.gov/vuln/detail/CVE-2024-20380
github.com/advisories/GHSA-m2rv-2ggp-66m7
suse.com/support/update/announcement/2025/suse-su-20250325-1
bugzilla.suse.com/1102840
bugzilla.suse.com/1103032
Show 14 moreShow less
bugzilla.suse.com/1180296
bugzilla.suse.com/1202986
bugzilla.suse.com/1211594
bugzilla.suse.com/1214342
bugzilla.suse.com/1232242
bugzilla.suse.com/1236307
suse.com/security/cve/CVE-2018-14679
suse.com/security/cve/CVE-2023-20197
suse.com/security/cve/CVE-2024-20380
suse.com/security/cve/CVE-2024-20505
suse.com/security/cve/CVE-2024-20506
suse.com/security/cve/CVE-2025-20128
suse.com/support/update/announcement/2025/suse-su-20250327-1
suse.com/support/update/announcement/2025/suse-su-20250328-1
Left out here: the rest of 3 source descriptions. The JSON record has them.