CVE-2021-1404: Clamav

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

A vulnerability in the PDF parsing module in Clam AntiVirus (ClamAV) Software versions 0.103.0 and 0.103.1 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper buffer size tracking that may result in a heap buffer over-read. An attacker could exploit this vulnerability by sending a crafted PDF file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to crash, resulting in a denial of service condition.

Affected products

• Clamav Clamav: version 0.103.0 only; version 0.103.1 only

Published 2021-04-08. Last modified 2026-06-17.