Is CVE-2021-1404 actively exploited?

No active exploitation of CVE-2021-1404 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-1404 be exploited remotely?

Yes. CVE-2021-1404 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-1404?

CVE-2021-1404 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2021-1404

CWE-20Published: April 8, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-1404 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.