High severity · published Jul 1, 2026
CVE-2026-20216
ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CS
Cisco Secure Endpoint · Cisco
7.0.5; 6.2.19; 7.3.3; 7.2.13; 6.1.5; 6.3.1; +34 more · source: vendor
CL
Clamav · Clamav
before 1.4.5; 1.5.0 before 1.5.3 · source: NVD
SE
Secure Endpoint · Cisco
before 1.27.2; before 1.29.0; before 8.6.2 · source: NVD
Affected product
CS
Cisco Secure Endpoint
Cisco
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