CVE-2022-20803: ClamAV Double-free Vulnerability in the OLE2 File Parser

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-17 · updated 2026-06-17
Weakness: CWE-415

Description

A vulnerability in the OLE2 file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device.The vulnerability is due to incorrect use of the realloc function that may result in a double-free. An attacker could exploit this vulnerability by submitting a crafted OLE2 file to be scanned by ClamAV on the 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: from 0.104.0 before 0.104.3 — fixed in 0.104.3

How to fix

Upgrade to a fixed version: Cisco ClamAV 0.104.3. Check the vendor advisory for mitigations.

References

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