CVE-2026-20216

ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability

Published Jul 1, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Endpoint

unknown

Version	Status	Constraints
`7.0.5`	affected	—
`6.2.19`	affected	—
`7.3.3`	affected	—
`7.2.13`	affected	—
`6.1.5`	affected	—
`6.3.1`	affected	—
`6.2.5`	affected	—
`7.3.5`	affected	—
`6.2.1`	affected	—
`7.2.7`	affected	—
`7.1.1`	affected	—
`6.3.5`	affected	—
`6.2.9`	affected	—
`7.3.1`	affected	—
`6.1.7`	affected	—
`7.2.11`	affected	—
`7.2.3`	affected	—
`7.1.5`	affected	—
`6.3.3`	affected	—
`7.3.9`	affected	—
`6.2.3`	affected	—
`6.1.9`	affected	—
`6.0.9`	affected	—
`7.2.5`	affected	—
`6.0.7`	affected	—
`6.3.7`	affected	—
`1.12.3`	affected	—
`1.8.0`	affected	—
`1.11.1`	affected	—
`1.12.4`	affected	—
`1.10.0`	affected	—
`1.12.0`	affected	—
`1.8.1`	affected	—
`1.10.1`	affected	—
`1.12.1`	affected	—
`1.12.6`	affected	—
`1.14.0`	affected	—
`1.10.2`	affected	—
`1.12.7`	affected	—
`1.12.2`	affected	—
`1.6.0`	affected	—
`1.9.0`	affected	—
`1.11.0`	affected	—
`1.7.0`	affected	—
`1.13.0`	affected	—
`1.8.4`	affected	—
`1.13.1`	affected	—
`1.9.1`	affected	—
`1.12.5`	affected	—
`1.13.2`	affected	—
`8.1.7.21512`	affected	—
`8.1.7`	affected	—
`8.1.5`	affected	—
`8.1.3.21242`	affected	—
`8.1.3`	affected	—
`8.1.5.21322`	affected	—
`8.1.7.21417`	affected	—
`1.14.1`	affected	—
`1.15.1`	affected	—
`1.15.2`	affected	—
`1.15.3`	affected	—
`1.15.4`	affected	—
`1.15.5`	affected	—
`1.15.6`	affected	—
`1.16.0`	affected	—
`1.16.1`	affected	—
`1.16.2`	affected	—
`1.16.3`	affected	—
`1.18.0`	affected	—
`1.18.1`	affected	—
`1.20.0`	affected	—
`1.21.0`	affected	—
`1.21.1`	affected	—
`1.21.2`	affected	—
`1.21.3`	affected	—
`1.22.0`	affected	—
`1.22.1`	affected	—
`1.22.2`	affected	—
`1.22.3`	affected	—
`1.22.4`	affected	—
`1.24.0`	affected	—
`1.24.1`	affected	—
`1.24.2`	affected	—
`1.24.3`	affected	—
`1.24.4`	affected	—
`1.26.0`	affected	—
`1.24.5`	affected	—
`1.26.1`	affected	—
`1.27.0`	affected	—
`1.15.0`	affected	—
`1.17.0`	affected	—
`1.17.1`	affected	—
`1.17.2`	affected	—
`1.19.0`	affected	—
`1.20.1`	affected	—
`1.20.2`	affected	—
`1.20.3`	affected	—
`1.20.4`	affected	—
`1.20.5`	affected	—
`1.20.6`	affected	—
`1.23.0`	affected	—
`1.23.1`	affected	—
`1.20.7`	affected	—
`1.20.8`	affected	—
`1.25.0`	affected	—
`1.25.1`	affected	—
`1.25.2`	affected	—
`1.27.1`	affected	—
`1.27.2`	affected	—
`7.3.13`	affected	—
`7.3.15`	affected	—
`7.4.1`	affected	—
`7.4.1.20425`	affected	—
`7.4.1.20439`	affected	—
`7.4.3`	affected	—
`7.4.3.20679`	affected	—
`7.4.5`	affected	—
`7.5.1.20813`	affected	—
`7.5.1.20833`	affected	—
`7.5.3`	affected	—
`7.5.5`	affected	—
`8.0.1.21160`	affected	—
`8.0.1.21164`	affected	—
`7.5.7`	affected	—
`7.5.9`	affected	—
`7.5.11`	affected	—
`8.1.7.21585`	affected	—
`7.5.13.21586`	affected	—
`7.5.13.21598`	affected	—
`8.2.1.21612`	affected	—
`8.2.1.21650`	affected	—
`7.5.15.21611`	affected	—
`7.5.17.21680`	affected	—
`8.2.3.30119`	affected	—
`8.2.4.30130`	affected	—
`8.4.0`	affected	—
`7.5.19`	affected	—
`8.4.1.30298`	affected	—
`8.4.2.30317`	affected	—
`8.4.1.30307`	affected	—
`7.5.20`	affected	—
`8.4.3`	affected	—
`8.4.4.30419`	affected	—
`8.4.4.30467`	affected	—
`7.5.21.21732`	affected	—
`8.4.5.30483`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:cisco:secure_endpoint::::::macos::*
	cpe:2.3:a:cisco:secure_endpoint::::::linux::*
	cpe:2.3:a:cisco:secure_endpoint::::::windows::*

Configuration 2 [-]

OR	cpe:2.3:a:clamav:clamav::::::::
	cpe:2.3:a:clamav:clamav::::::::

No data.

Vendor Product Versions

Cisco

Secure Endpoint

Version	Status	Scheme	Platform
`7.0.5`	affected	semver	—

Clamav

Version	Status	Scheme	Platform
`—`	affected	—	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4852-1	clamav security update
Ubuntu USN	USN-8517-1	ClamAV vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.573% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-20216
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR
https://www.cve.org/CVERecord?id=CVE-2026-20216

History

Jul 3, 2026 12:15 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-20216 https://www.cve.org/CVERecord?id=CVE-2026-20216
Metrics	threat_severity `None`	threat_severity `Important`

Jul 1, 2026 6:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 1, 2026 5:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability
Weaknesses		CWE-770
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`