What’s Vulnerable › Vulnerabilities

CVE-2021-1404: Clam AntiVirus (ClamAV) Email Parser Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-08 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Cisco ClamAV: 0.103.0, 0.103.1

References

• https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
• https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html

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