Is CVE-2021-1252 actively exploited?

No active exploitation of CVE-2021-1252 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-1252 be exploited remotely?

Yes. CVE-2021-1252 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-1252?

CVE-2021-1252 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2021-1252

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

7.5

CVSS v3.1

Official Description

A vulnerability in the Excel XLM macro 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 error handling that may result in an infinite loop. An attacker could exploit this vulnerability by sending a crafted Excel file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process hang, resulting in a denial of service condition.

NVD Source

Technical Analysis

CVE-2021-1252 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.